Personally, I don't even know what is ICQ. Maybe I'm just too young to know it
I googled it and I see it's old thing which isn't popular anymore.
And on Bitcointalk there are some more obsolette services which can be added to our profiles - AOL messenger, MSN messenger, Yahoo messenger. Even Skype isn't popular as it was 6-8 years ago. I don't know is it possible to remove it from SMF, maybe it's difficult or theymos just don't see reasons to do that. But it would be cool to replace it with services which are really used by people nowadays - Telegram, Facebook, Twitter and something similar.