I assume you all know what Facebook is (if not go to www.facebook.com). A couple of weeks ago Facebook launched a thing called Facebook chat and slowly added the feature to more people’s accounts.
I have had mine for about a month now, so have had a good amount of time to play with it. The one thing I initially found about Facebook chat is that it was slow, to send and receive messages. but the more time I have spent with it the less you notice it,. One thing about it that is not a feature that is cool, is that during this month of using it I have only once logged on to find no one on and that was at 1 in the morning, so no surprise there. I think this is due to how easy it is to add and find friends compared to thing like MSN. The UI is really nice to use and simple, it fits in well with the Facebook look. 
One thing that has annoyed me is that since they have put this feature in they seem to have become Twitter (always down). This really annoys me as it is a great feature and now I use Facebook a lot morebecasue of it. the feature appear at the bottom of the browser windows, there are 3 buttons at the bottom of your screen that make up this feature far left is notifications, Who is online and your chat . When you chat you get a little bleep telling you have a message, and you can see other peoples status.
Overall Facebook chat is great reason to use Facebook on its own. The only real down fall is the that it is a bit slow to send and receive messages, but other wise it is great addition to Facebook and i love it.
