http://googleblog.blogspot.com/2010/04/replay-it-google-sear...
"For our initial release, you can explore tweets going back to February 11, 2010, and soon you’ll be able to go back as far as the very first tweet on March 21, 2006"
But the search is still limited to 2010 as of February 2011.
I wonder if the reason is technical or "political" ?
So I have no problem with Twitter being incorporated into my search results.
Also, I think Bing launched something similar over a year ago, at least from Twitter and Faceboook (see http://www.discoverbing.com/facebook/) .
One thing though - some people in my social circle are (obviously) more important than others. Is there a way that links from these folks are ranked higher than those from less important people? If not, this is something that should be configurable by the user (e.g. "See more links from Jack [x]" or "See less links from Mary [x]").
Not that experts will not be able to utilize their network of site owners, but the results will be even more personalized, and when nobody can permanently rank #1 on Google for any keyword, searchers win.