tedster - 4:18 am on Feb 18, 2011 (gmt 0)
It's for any connections that you enable in your Google Profile [google.com]. Looks quite different than it did when I first set mine up. I'd say Google Buzz is evolving - and this integration of social results in the SERPs is another step.
Thanks for the info about local news, frontpage. You may turn me into a convert with observations like that.