You have no Linux users in your UI testing groups. Either that, or you ignore them. Or they don’t actually test. It’s one of those. I state this merely because Firefox 3 on Linux is not compatible with your new design. This has been tested in Arch Linux and the version of Ubuntu that came out back in April.
So anyway. The links on the main page don’t work. You must click a link, then refresh the page to be taken to your destination.
On a completely different note, it’s somewhat disappointing to see that you switched from one fixed-width style to another. I used to be able to have a web browser on the left sode of my desktop and IM windows on the right side. Now my browser needs to be about 170 pixels wider, so it overlaps. The worst part is how much seems to be dedicated to ads (a large number of which are either completely irrelavent to me or offensive. I shamelessly block them) and whitespace. Yeah, the new layout seems a lot cleaner, but a lot of that is because you bought the whitespace by making the user resize the window larger. And what’s up with 1/3 of the viewable area not being used while looking at wall-to-wall conversations? It would have been a lot more nifty if the layout flowed depending on how wide the window was.
Just some thoughts.
P.S. Oh, just remembered. That you know that guy Joe Minifeed? Why are you calling him “Mr. Wall” now?
P.P.S. Try loading the main page with the window not full length. Scroll to the right. Note the fun redraw issues. I’ll bet we see Firefox 3.0.2, “Facebook Edition” pretty soon.