[Wilduck]

Which are all fine if you're using GTalk. However, if all your friends use FB chat, you're probably not going to switch.

Back when I was in middle/high school, people I knew used AIM, not Yahoo Messenger, or MSN Messenger because that's where their friends were. The fact that they were essentially the same just served to enforce the point that AIM would have had to make a very major blunder for anyone to switch. The same holds for facebook chat.