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Top 56 Digital Marketing Expert



Want to know more about specific aspects of digital marketing, but not sure who to follow? There are tons of digital marketing experts to choose from—the doers, the speakers, the writers, the researchers, and so on. In this post, we’re going to look at the top digital marketing experts you can follow in specific areas (use these links to navigate):
Note that while some experts only talk about their area of expertise, others talk about digital marketing as a whole. Experts were discovered using a combination of Klout topic expert rankings, Followerwonk Twitter bio searches and Twitter account searches.

Content Marketing Experts

Content marketing can be a part of your overall digital marketing strategy. You can optimize your content for conversions, email content to your list, drive traffic to content through paid advertising, optimize content to rank for specific keywords in search and use content to keep social media accounts active. Here are some of the top recommended experts in content marketing.

Arnie Kuenn

Arnie Kuenn is the founder and CEO of Vertical Measures. He is author of “Accelerate: Move Your Business Forward Through the Convergence of Search, Social, and Content Marketing”; and co-author of “Content Marketing Works: 8 Steps to Transform your Business.”

Heidi Cohen

Heidi Cohen is the Chief Content Officer at Actionable Marketing Guide and President of Riverside Marketing Strategies. She is co-author of “Instant Content Marketing Success: 10 Tips from Leading Content Marketing Experts.”

Robert Rose

Robert is the Chief Strategy Officer for the Content Marketing Institute and a senior contributing consultant for Digital Clarity Group. He is co-author of “Experiences: The 7th Era of Marketing and Managing Content Marketing.”

Michael Brenner

Michael Brenner is the founder of B2B Marketing Insider and Head of Strategy at NewsCred, a leading content marketing software platform.

Jeff Bullas

Jeff Bullas is a blogger, author, strategist and speaker. He has been recognized by Forbes, Inc., Huffington Post, Social Media Examiner, LinkedIn, and others as an authority in digital marketing, content marketing and social media marketing.

Joe Pulizzi

Joe Pulizzi is the founder of Content Marketing Institute and Content Marketing World. He is author and co-author of several books including “Epic Content Marketing,” “Managing Content Marketing” and “Content Inc.” He also runs two podcasts on content marketing on iTunes: Content Inc. and PNR: This Old Marketing with Robert Rose.

Jay Baer

Jay Baer is the founder of Convince & Convert. He is author of “Youtility: Why Smart Marketing is About Help Not Hype” and “The Now Revolution: 7 Shifts to Make Your Business Faster, Smarter, and More Social.” He also runs the Social Pros Podcast on iTunes.

Ann Handley

Ann Handley is the Chief Content Officer of MarketingProfs and co-founder of ClickZ. She is also the author of “Everybody Writes: Your Go-To Guide to Creating Ridiculously Good Content” and “Content Rules: How to Create Killer Blogs, Podcasts, Videos, Ebooks, Webinars and More That Engage Customers.”

Lee Odden

Lee Odden is the founder of TopRank Marketing. He is author of “Optimize: How to Attract and Engage More Customers by Integrating SEO, Social Media, and Content Marketing.”

Conversion Rate Optimization Experts

If you are driving traffic to a website that is not optimized for conversions, then you are likely throwing all of your marketing dollars down the drain. Here are some of the top recommended experts in conversion rate optimization.

Angie Schottmuller

Angie Schottmuller is an inbound marketing thought leader skilled at wielding magnetic content optimized for search, social, conversion and mobile.

Peep Laja

Peep Laja is the founder of ConversionXL. He is author of “How to Build Websites that Sell: The Scientific Approach to Websites”; “Master the Essentials of Conversion Optimization: Experts’ Approach to Optimization”; and “How to Persuade People: Hidden Secret Mind Tricks.”

Chris Goward

Chris Goward is the founder of WiderFunnel, the full-service marketing optimization agency that pioneered landing-page and conversion-rate optimization methods. He is author of “You Should Test That: Conversion Optimization for More Leads, Sales and Profit.”

Brian Massey

Brian Massey is the Conversion Scientist at Conversion Sciences, the agency whose conversion optimization process will generate more sales from your website. He is author of “Your Customer Creation Equation: Unexpected Website Formulas of the Conversion Scientist.” He also runs the Conversion Scientist podcast on iTunes.

Oli Gardner

Oli Gardner is the co-founder of Unbounce, the popular marketing tool that allows marketers to build, publish, and A/B test landing pages without IT.

Craig Sullivan

Craig Sullivan is the Optimizer in Chief of Optimal Visit, helping increase conversion and improve the UX of their multi-channel and multi-platform businesses.

Joanna Wiebe

Joanna Wiebe is the founder of Copy Hackers, the home of conversion copywriting.

Tim Ash

Tim Ash is the CEO of SiteTurners and founder of the worldwide Conversion Conference events. He is co-author of “Landing Page Optimization.” He also runs the Landing Page Optimization podcast on iTunes.

Rich Page

Rich Page is the founder and principal consultant for Website Optimizer. He is author of “Website Optimization: An Hour a Day” and co-author of “Landing Page Optimization: The Definitive Guide to Testing and Tuning for Conversions.”

Bryan Eisenberg

Bryan Eisenberg is the co-founder and CMO of IdealSpot. He is co-author of several books including “Buyer Legends: The Executive Storyteller’s Guide”; “Call to Action: Secret Formulas to Improve Online Results”; “The Best Damn Web Marketing Checklist Period”; “Persuasive Online Copywriting: How to Take Your Words to the Bank”; “Always Be Testing: The Complete Guide to Google Website Optimizer”; and “Waiting for Your Cat to Bark: Persuading Customers When They Ignore Marketing.”

Data and Analytics Experts

You can’t expect to do digital marketing without looking at some data to ensure that your strategies are making a positive impact on your bottom line. Here are some of the top recommended experts in data and analytics.

Dan Zarrella

Dan Zarrella is the award-winning social media scientist at HubSpot. He is author of “The Science of Marketing: When to Tweet, What to Post, How to Blog, and Other Proven Strategies,” “The Social Media Marketing Book” and “The Facebook Marketing Book.”

Daniel Waisberg

Daniel Waisberg is an Analytics Advocate at Google and the Founder of Online Behavior. He is author of the upcoming “Google Analytics Integrations” book.

Annie Cushing

Annie Cushing is the founder of Annielytics and former VP of Marketing at YourTango.com. She oversees analytics and all reporting efforts for her clients.

Brian Clifton

Brian Clifton is a measurement strategist, advisor and renowned practitioner of website performance optimisation and former head of Web Analytics for Google. He is author of a series of books on “Successful Analytics” and “Advanced Web Metrics with Google Analytics.”

Eric Peterson

Eric T. Peterson is the founder and senior partner of Analytics Demystified, a web analytics and optimization consulting firm. He is author of “Web Analytics Demystified: A Marketer’s Guide to Understanding How Your Web Site Affects Your Business”; “Web Site Measurement Hacks: Tips & Tools to Help Optimize Your Online Business”; and “The Big Book of Key Performance Indicators.”

Avinash Kaushik

Avinash Kaushik is the co-founder and Chief Education Officer for Market Motive and Digital Marketing Evangelist for Google. He is author of “Web Analytics 2.0 and Web Analytics: An Hour a Day.”

Email Marketing Experts

It’s becoming harder to reach your customers through organic search with so many changes to the Google search algorithm. It’s also harder to reach your customers on social media due to the decline of organic reach. This is why your email list is more important than ever. Here are some of the top recommended experts in email marketing.

Tink Taylor

Tink Taylor is founder and COO of dotmailer and dotDigital Group. He serves as a key and influential member of the UK Direct Marketing Association’s Email Council and also the International Advertising Bureau.

Justine Jordan

Justine Jordan is the marketing director at Litmus. She organizes the Email Design Conference in Boston and London.

Jordie Van Rijn

Jordie van Rijn is the founder of Email Monday and a email marketing consultant. He was recognized as one of the Top 50 Email Marketing Influencers in 2014 by Cision.

Dr. Dave Chaffey

Dr. Dave Chaffey is the co-founder of Smart Insights. He is author of “Digital Business & E-Commerce Management”; “Emarketing Excellence: Planning and Optimizing Your Digital Marketing”; “Digital Marketing: Strategy, Implementation, and Practice”; and “Total E-mail Marketing.”

Chad White

Chad White is the Research Director at Litmus, a provider of email creation, preview and analytics tools. He is author of “Email Marketing Rules: A Step-by-Step Guide to the Best Practices that Power Email Marketing Success.”

Loren McDonald

Loren McDonald is the Vice President of Industry Relations, where he educates clients and prospects on best practices and emerging trends in email, mobile and social marketing and marketing automation. He is author of “Almost Everything You Wanted to Know About Email Marketing.”

Dennis Wakabayashi

Dennis Wakabayashi is the Director of Digital and Social Strategy for the McDonald’s account with Morach Partners.

Mark Brownlow

Mark Brownlow is the founder of Email Marketing Reports, a freelance business writer and speaker.

Pay Per Click Experts

Sometimes, organic tactics are not enough. When you start paying for advertising, the rules change—you have to find the right combination of commercial keywords and conversion-optimized, highly targeted landing pages to get results. Here are some of the top recommended experts in PPC.

Lisa Raehsler

Lisa Raehsler is the founder of Big Click Co. She was recognized as one of the most influential PPC experts in 2012, 2013, and 2014 by PPC Hero Blog.

Kim Clinkunbroomer

Kim Clinkunbroomer is the Executive Vice President of Paid Search Marketing and a Partner at Philly Marketing Labs.

Matt Umbro

Matt Umbro is the Senior Account Manager in charge of Community at Hanapin Marketing. He oversees content production for PPC Hero. He also runs the popular #PPCChat Twitter hashtag.

David Szetela

David Szetela is the founder of Clix Marketing. He is author of “Customers Now” and co-author of “Pay-Per-Click Search Engine Marketing: An Hour a Day.” He also runs the PPC Rockstars podcast on iTunes.

Melissa Mackey

Melissa Mackey is Search Supervisor at gyro, the largest independent B2B agency in the world. She is author at Beyond the Paid, a blog on PPC strategy.

Brad Geddes

Brad Geddes is the Founder of Certified Knowledge, a company dedicated to PPC education & training. He is the author of “Advanced Google AdWords” and the only person selected by Google to conduct the Advanced AdWords seminar series. He also runs the Marketing Nirvana podcast on iTunes.

Jennifer Slegg

Jennifer Slegg is a Search Engine Marketing Consultant and regular contributor at the SEM Post. She regularly speaks at Pubcon, SMX, ClickZ and other industry events on search engine marketing.

Larry Kim

Larry Kim is the founder and Chief Technology Officer of WordStream. He was recognized as one of the most influential PPC experts in 2013 and 2014 by PPC Hero Blog.

Search Engine Optimization Experts

Search engine optimization touches all aspects of your digital marketing strategy. From the start, your website should be optimized for your top keywords. To ensure your website ranks well for additional keywords, you have to create keyword-optimized content. To help customers find you on social media, you must have keyword-optimized social profiles. Here are some of the top recommended experts in SEO.

Julie Joyce

Julie Joyce is the owner of and Director of Operations for Link Fish Media, Inc., a link building company based in Greensboro, that specializes in creating custom link building campaigns for clients. She is also a founding member of the SEO Chicks and Avant Greensboro.

Wil Reynolds

Wil Reynolds is the founder of Seer Interactive, a Philadelphia-based SEM/SEO consulting firm that puts equal focus on doing great things for its clients, its team and the community at large.

Michael King

Michael King is the founder of iPullRank and leads teams covering consumer insights, content, social strategy, SEO and marketing automation. He is a regular speaker at SEO industry conferences including SMX East, SearchLove NYC, Seattle Interactive, SMX Israel, SMX West, SES New York, LinkLove London, SMX Advanced and MozCon.

Ann Smarty

Ann Smarty is the Community and Brand Manager of Internet Marketing Ninjas and founder of MyBlogU, a collaboration network for creating epic content. She is a contributor for Search Marketing Standard magazine, a premium online marketing publication delivered via print.

Danny Sullivan

Danny Sullivan is a Founding Editor of Search Engine Land. He serves as Chief Content Officer for Third Door Media, which publishes Search Engine Land and produces the SMX: Search Marketing Expo conference series.

Barry Schwartz

Barry Schwartz is the CEO of RustyBrick, a New York Web service firm specializing in customized online technology that helps companies decrease costs and increase sales.

Rand Fishkin

Rand Fishkin is the founder and former CEO of Moz. He is co-author of “Inbound Marketing and SEO: Insights from the Moz Blog” and “The Art of SEO: Mastering Search Engine Optimization.”

Kumar Vivek

Kumar Vivek is the founder of Vidhiweb Solutions & WebVisitors. He is member of “Inbound.org” and Guest Blogger of APPSeCONNECT, InSync & TradeDesk. He is also the active member of Stackoverflow

Social Media Marketing Experts

Social media is an important part of your business’s branding. You can use it to connect with your potential customers, current customers and brand advocates. You can use it to show the human side of your brand. And, of course, you can use it to promote your content, your products and your services. Here are some of the top recommended experts in SEO.

Sandi Krakowski

Sandi Krakowski is the founder and president of A Real Change International, Inc. and Sandpaper Tablet, Inc. She is author of “#BeMore” and “Read Their Mind: How to Hear What the Marketplace Wants and Build a Huge Business.”

Peg Fitzpatrick

Peg Fitzpatrick works with Guy Kawasaki on social media marketing strategy and is the director of digital marketing for Kreussler Inc., covering the online brand management and as well as traditional marketing. She is co-author of “The Art of Social Media: Power Tips for Power Users.”

Andrea Vahl

Andrea Vahl is a social media consultant and speaker who is passionate about helping small businesses understand and leverage the power of social media to actually grow their business.  She is co-author of “The Facebook Marketing All-in-One for Dummies.”

Pam Moore

Pam Moore is CEO and co-founder of Marketing Nutz, a full service digital marketing, experiential branding agency based in Orlando. She has been recognized by Forbes as a Top 10 Social Media Power Influencer.

Rebekah Radice

Rebekah Radice is a social media strategist, speaker and digital marketing specialist, the Chief Experience Officer of Imagine WOW, a digital marketing agency. She is co-author of “Fire Up! Taking Your Life and Business to 11.”

Mari Smith

Mari Smith is one of the world’s leading social media thought leaders, widely recognized for her Facebook marketing expertise. She is co-author of “The New Relationship Marketing: How to Build a Large, Loyal, Profitable Network Using the Social Web and Facebook Marketing: An Hour A Day.”

Viveka von Rosen

Viveka von Rosen is the CEO of Linked Into Business and co-founder of Linked Prospecting. She is author of “LinkedIn Marketing: An Hour a Day.”

In Conclusion

These are not, by any means, the only digital media experts and thought leaders out there. This list could go on and on and on. If you want to find more experts in a particular area of digital marketing, you can do so by logging into LinkedIn, visiting the profiles of people mentioned above and looking at the People Also Viewed column at the right of their profile. You will find up to 10 more suggested people who have similar expertise. Enjoy!
Blog Courtesy :  Sprout Social 

SEO : Today A Brief Overview


SEO it takes discipline, practice, and patience. It helps to have a checklist to keep yourself (and your team) on track.


Let Us Know what you think about it after sharing the comment below on this Blog.

3 Ways To Get Back on Track



We all knew about it that SEO Strategy is constantly changing and evolving as per the Google Algorithms Update. If you think that your organic search traffic have dropped simultaneously then here are the 3 steps you can follow to stop your search traffic result.

Avoid Content Anthropophagy : Be assure that whenever you are writing blog, white papers, landing page content or other resources of the content then be assure that your content should not repeat or content topic should different.

For Example : If you are offering some services and suppose to write blog on it then be assure that you haven't write same topic blog before it. Because it will reduce the “novelty score” of the Keywords and your content will loss uniqueness of the content.

Recommended for You
Webcast: The Lead Scoring Equation: Behavior + Demographics = Customers

TIP: You can keep track all the content on a spreadsheet it will reduced your redundancy of the blog.


Your Content Should Be Valuable : This is the most important aspect for the content writer, If you are writing any content, So before write on it do some research it will help to write blog with uniqueness as well as your blog will be also unique. So the user will get unique piece of content from your blog. It will help to increase user engagement.
Always try to write for the user not for the search engine means whatever you are writing it should be unique with some checklists, quizzes, charts or graph to enhance your content.


Write Content for the User Not for the Search Engine : As we know at the last stage writing such content is pointless if you get alots of user and they are not converting into the sales. So each content should have some purpose with overall business goal and the content should be balanced with promotional content as well as seo effective. So always try to get visitors detail from the content, include atleast one call to action button within your content.

The 100 Most Popular Google Keywords


We all know about the term like “Gmail” and “Craigslist” are frequently searched keywords and all they have there own user base due to there brands value but what about non-brands ? What about true keywords that, undoubtedly, are the aim of many traffic-thirsty SEOs across the world?

Lets check it with the help of this Infograph designed by siegemedia

Is Technology Impacting Your Email Conversion Rate?


Here we go with the Infograph.

How to Design Customers Engaging Website


Want to know more about redesigning of your website for user engagement, here we go wit the infograph which is usually created for doing help and highlights the main areas that you need to focus on design, development and call-to-action. One of the Most Important thing is that while redesigning the website if possible do it in the other server don't interrupt main server of the website otherwise you may loss the revenue.


Now Google Start Domain Registration Service.

Recently Google had started domain registration service in USA, which is available only for the people in USA through Invitation System. But Now it is open for all the citizen for the USA.  

This service provides you the facility of domain registration with some of the extra feature like private registration, email forwarding to Gmail, support for up to 100 sub-domains, and domain forwarding. The service starts from $12 per year with some of the additional fee if you want to take advantage of Google Partner's such as Squarespace, Weebly, and Wix. Google also provide a support service for the blogger if you want to link your blog with new domain name. 

During initial testing period (from June to December) Google received a lots of feedback then they have improved a lots of feature now there dashboard is more improved with more then 60 domain extensions and better search tools for finding perfect URL. 

Google will notified if this services is available in your country.

Learn SEO : Search Engine Optimization

Here is a info-graphics, you can Check out for clear Understanding of SEO.


Infographic By : SEOLution

Search Card for Google Trends

Now Whenever you will search [2014] on Google, Google will show you a Search Card with Top 5 trending topics from your Country from where you are searching. You may also search most popular searches in the different - different Company by typing "Explore 2014 trending topics" in Google Search Box. There is "Global" option that shows Worldwide trending Searches.




This is first time when Google Zeitgeist is displayed in Google Search Result. As Google explain 
"search statistics are automatically generated based on the billions of searches conducted on Google," 
So it just next to the Google's Search Results. 

Google Panda 4.1 Update

Pierre Far, Webmaster Trends Analyst at Google UK, announced that Google Panda 4.1 Update is rolling out. Now due to this update Google confirm that it is able to help identify low quality content more accurately. Due to this update now small and medium sized sites are said to be ranking high which is really a good news.Another good news is that if your are penalized by Previous Panda Update then its time to get away and ranked high. If you see increment on your site then its a good sign and this update work within your favor. One thing also that if this update is favor of some-one then it may be that it will not favor another and your site ranking will get decrease, If your site have low quality content. 


Loren Baker took a moment to weigh in on this update and provide his expert analysis:


This new Panda algorithmic update reinforces the fact that Google is not a fan of thin content and that crawl efficiency along with serving clear and direct data messages to Google are becoming more important than ever.
Specializing XML sitemaps, trimming back on thin content and making sure that you are serving Google exactly what they need with minimal effort expended on part of Google-bot needs to be a huge emphasis. More so, also making sure that even in XML sitemaps, crawl priority is properly defined, and old content is not recrawled unless there is specific reason.
The more that SEOs can serve Google basic data without mixed messages (for example conflicts with sitemap, WMT, URL parameter and robots.txt commands) the more Google is going to reward the SEO.
Depending on where you’re located, around 3-5% of queries are affected. 
This Update is also notify by the Google Spam Head Matt Cutt.

Grey Hat SEO tactic to save you from Copy Content Issue.

In Search Engine World, We can do allots of Grey hat tactics to save from Copy Content Issue. If we are creating a content which is copied by our own site then we should use 301 redirect method. 301 Redirect Method is a signals that page has been moved permanently and you are requesting to the search engine that remove the page from Index and pass link juice to another redirected page.  

While Canonical is one of the Example of the document that it has multiple version. I.e. if your website have http://www.yoursite.com/, http://yoursite.com/, http://www.yoursite.com/index.php or http://yoursite.com/index.php. All these are the Same webpage link but any Search Engine Crawler thought that, It have 4 different type of Website and your Site might be outranked by Panda update, due to Copy Content Issue. 
Now i am discussing about when and why you should use these things. 
  1. 301 Redirects: 301 Redirect Method is a signals that page has been moved permanently and you are requesting to the search engine that remove the page from Index and pass link juice to another redirected page. 

When 301 Redirection Required:
  •  When you are re-branding your Website, Such as your Website has permanently moved.
  •  If you want to Replace your webpage with same content
  •  When your have expired Webpage Content or you get 404 error. 
Some of the Common Problem Occur:
  • You should have access of FTP or Server.
  • Sometime Search Engine didn't remove the Content of the Website from there ranking then you will have to submit your Site through Webmaster.  
  • Redirection not used properly. 
  1. Canonical Attribute : According to Wikipedia the definition of Canonical is "A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred", version of a web page as part of search engine optimization." But In my view i have already definite above. Now i would like to tell you that Canonical Attribute is not a redirect Method. When you implement rel="canonical" then it will not redirect your visitor to the new URL, It is a signal which is used for the Search Engine Crawler to Understand, Which page is to index or which page is not. 
When to implement canonical Attribute: 
  •  When your Content is Similar and both Webpages are remain visible. 
  •  Content Syndication
  •  Dynamically Generated Page. Then you will have to handle these page through webmaster and inform Google about it. 
  •  When you are not Implement 301 Redirect on any pages. 
Some of the Common Problem Occur:   
  •  After Implementation of rel Canonical attribute, still your Page is seen on search engine or may be ignored by Search Engine.
  • Misused of tag on the Webpages.
  • When Implementation is Incorrect 
Now in Next Blog


                     We Will Learn how to add Canonical attribute via HTTP headers, so you can easily update huge amount of Pages.

15 Best SEO Tips for Better Result in Search.

Everyone likes Good Tips and trick? Here I am providing you some great tips of Search Engine Optimization. So that newcomers will learnt allots of things and help with this article.

1) Content is king: Whenever you will create a single link then be sure that you have good, well-written and unique content which is focus on your primary keyword or keyword phrase.

2) If content is king, then links are queen: Be sure the link whatever you are creating should be good quality with high PR Links. So that you can get a better link juice from that site.
3) Be sure that your every page should have focused unique Title Tag: Whenever you will insert the title tag on every page of the website then keep in mind that your website have unique title on every page and also if you want to promote your company then you can add your company name at the end of the page.
4) Use a Blog Page: In a blog page you can always update some fresh content related to your business because fresh content can help to improve your website ranking. The Crawler always look your website and your rank will increase very soon.
5) Always use keyword to link your site : In other words if you are targeting the Keywords "Moving Toronto" then always use link to "Moving Toronto" instead of "click here" link.
6) Focus on Phrase not on the Keywords: Whenever you will use the keywords anywhere then convert that keywords with a phrase mixed with keywords and your location which helps in your local searches too.
7) Website should be SEO Friendly: Please Please Please don't design your Website without Consult with SEO Guys. Make sure that your Web designer should have knowledge of Organic SEO and never use flash on your site.
8) Use your keywords on everywhere: If you want to rank your site properly then you should be keywords and keywords phrase in text link, image alt tag attribute and even though in your domain too.
9) Check canonical issue: Check which url you want on your website whether it is with www or without www and then redirect the same with 301 redirect. In other words if you will not solve this issue then crawler will check both the link and thought that you have different - different website with same content. Which is really harm for your website.
10) Create Quality Link not Quantity: Whenever you will create link to your website always think quality not for quantity. When you create a high PR relevant link with your site then your site will suck allots of link juice with high PR Website which is really benefited for you.
11) Website should have Unique and quality Content: Every Search Engine Crawler like unique and quality content. So your website should have unique and high quality content. you can check your content uniqueness with double quote. Like put your content between double quote and search it if your content is copied then search engine will give you a bold sign.
12) Never used a paid link: you should never used any single paid link on your site because whenever you will create a paid link with your website then you will lose your website authority as well as money too.
13) Link from .edu or .gov domain: Always try to create some link with .edu or .gov domain because these domains give you nice weight by any search engine.

14) Targeted the Page with Keywords: Try to Optimized a single keywords phrase on single page. Don't try to optimize multiple keywords on single page which is not benefit for you.


15) Always Used Social Marketing: Social Media Marketing Is a part of SEO. So be sure to make link with the site like Digg, Yelp, del.icio.us, Face book, etc. Which is useful for website promotion as well as create better link juice?