Flock has finally released the Beta 1.0 version of its social browser, which is currently still in private beta. This is among the first browsers to be created around the act of social activity, enabling cross-network media-sharing and communication tools. This is primarily centered around its People Browser, and I happen to think the media tool is among the most important for Flock users as well.
Flock's social browser has been in the works for some time now, and after being inundated with several updates these past few months, today is somewhat of a milestone for Flock. The People Browser has been reported as not working properly for some, but I haven't had any problems with it, for any integrated social networks (Facebook, YouTube, etc.)