Msg#: 4355372 posted 8:20 am on Aug 26, 2011 (gmt 0)
A comprehensive study I read lately said that there is no DIRECT link between FB likes and rankings, just that sites that attract FB likes and shares also attract links and citations. Correlation != cause.
Google does pass PR and anchor text through even shortened urls (http://www.youtube.com/watch?v=QMkltd6dZzU) and Twitter, unlike FB, is open to Google and has many aggregators, some of whom strip off the nofollow attribute.
Msg#: 4355372 posted 2:06 pm on Aug 26, 2011 (gmt 0)
I don't think you can or should look at it as an either / or. If your content is shareable, you need to put the tools and the signals in place to make it easy to share everywhere someone would be likely to share it. I think that's what Google looks at - are people sharing your content across various networks and means? There's nothing so specific as a "tweet is better than a like"