Flock is a web browser built on Mozilla's Firefox codebase that specializes in providing social networking and Web 2.0 facilities built into its user interface.  Flock v2 was released on October 14, 2008. The Flock browser is available as a free … see full wiki
I've been using Flock for a few months now. I was first introduced to Flock by Ed Dale of the 30 Day Challenge. Other writer friends swore by it so I checked it out. It's always hard changing a browser but with Flock the transition was a piece of cake. Since I am in the visual communications business, being able to see my media in front of me and accessing my contacts on social networking sites was critical. With Flock I can do all of these, and everything is close by and intuitive. Since I write alot, Flock has been great for helping me quickly and professionally market my articles and publish my pictures and artwork. If you are a social media bug like I am, Flock is the way to go. Awesome browser!