If you are interested in Building Back-links then this post by Jay Bear is for you. Thanks Jay
If you would like to listen to Jay talk about Social Media check out this link to an interview on Garlick and Plum Jam.
Why haven’t you heard of these link sources before? You have. But you’ve probably been told they are a waste of time by your Web developer, who claims these big, popular sites aren’t useful for Google optimization.
The reason is that most powerhouse social media sites like Facebook and YouTube put a small piece of code called ‘the no follow’ tag into most areas of their site. As the name implies, the ‘no follow’ tells search engines: if someone tries to build back-links to their site from here, don’t follow it.
These are all real links, and are entirely legitimate and approved for optimization by Google.