I came across this and found it very interesting.Here's what I have gathered about google and social. It's not how many links you get, it's about the quality of those links. Links to your twitter are automated by people retweeting or mentioning you, and google indexing those. The quality is about the quality of those retweeters and accounts that mention you. All my twitter accounts are PR5+. That's what counts a little bit. If you have a twitter about music, having 1000 nobody followers will do nothing. Having Capital Records follow you, retweet you, or mention you, will count big time. There are other "quality" music twitters than capital. Just an example. The same could be said for google+, pinterest, facebook likes, etc. Pointless to get 10,000 useless likes from fake or nobody accounts. This is really just an extension of PR. Getting a zillion links from nobodies is useless. Getting one link from NYT will send you up the PR and authority chart.