I use, but not so much anymore, AIM. And throughout my whole time in computing, I have NEVER used ICQ. Not that I don't like it, I don't even know it. It's just that my friends had AIM from the beginning.
[ramble]
Now that I think of it, there's needs to be another popular IM service besides the ones by AOL or Microsoft. I know there's others out there, but they didn't seem to catch on as big as those two did. But I think texting blew IM out of the water anyways. I text waayyy more than I IM. I only get on iChat for video chatting nowadays.
[/ramble]
Do ppl in europe use MSN? I've known foreign exchange students who didn't have AIM but all had MSN.