Add comments Box to a Web Page

DISQUS is a comments platform that helps you build an active community from your website's audience. It has awesome features, powerful tools, and it's easy to install.
http://www.disqus.com 41



http://intensedebate.com 
IntenseDebate is a feature-rich comment system for WordPress, Blogger, Tumblr and many other blogging/CMS platforms. 45



Facebook Social Plugins › Comments
http://developers.facebook.com/docs/reference/plugins/comments/


http://sunsss.com

The Google Penguin Update Tips Advice

The Google Penguin Update
http://mattsmarketingblog.com/seo/the-google-penguin-update/


The Google Penguin Update: Over-Optimization, Webspam, & High Quality Empty Content Pages
http://www.seobook.com/penguin-update


Google Penguin Update Recovery Tips & Advice
http://searchengineland.com/penguin-update-recovery-tips-advice-119650


Google Penguin Update: 12 Tips Directly From Google
http://www.webpronews.com/google-penguin-update-12-tips-directly-from-google-2012-04


Penguin Analysis: SEO Isn’t Dead, But You Need to Act Smarter (And 5 Easy Ways to Do So!)
http://www.micrositemasters.com/blog/penguin-analysis-seo-isnt-dead-but-you-need-to-act-smarter-and-5-easy-ways-to-do-so/  


http://sunsss.com/seo