[joshuamarch]

Although they're obviously doing something around social search, as in their own system:

http://www.google.com/s2/u/0/search/social#socialcircle

[Stuk]

Posted here[0] where it was pointed out that that page has been around since 2009

[0] http://news.ycombinator.com/item?id=2319412

[tonfa]

This is not really new, I was playing with it more than a year ago.