Are you talking about the friends on chat feature? I was under the impression that it's just a list of your friends who are on facebook at that time and signed in to facebook chat.
Jeez, is there anywhere Wayne Sutton doesn't show up?!?? That guy is truly a social media superhero, I tell ya. In fact, I'm not wondering if this whole post isn't part of some elaborate viral marketing thingamabob that Wayne is orchestrating...
http://shegeeks.net/wp-content/uploads/2011/01/New-Facebook-...