Official Facebook Chat Now Available

"This week marks the launch of Facebook Chat—a new way for you to communicate with your friends in real-time. The Wall and Inbox have been the primary ways to communicate, but when more immediacy is necessary—for example when making plans for lunch in half an hour or arguing over a foul call in the NCAA tournament—they might not be enough. Chat aims to fill this gap.

We'll be rolling this out slowly going forward, but fairly soon you'll notice our new Chat bar at the bottom of your browser—no installation or assembly required. From this bar you can view your list of online friends and open conversations with any or all of them..."