I had a friend that would only talk over ICQ, waaaay after its heyday. I don't remember when I created the account, but I ended up with a 9-digit ID...which I somehow still remember. I was able to log in for the first time in probably 3 years (and input my password for about the first time in 10 years. Pidgin had been configured to auto-login to ICQ on a previous machine of mine).