I think that’s what the college kids were playing with when I was in high school.

Started college in 1995, and I indeed did have ICQ before too long. Still remember my number (6725571).

You probably had all three installed on your computer and probably all running at once.

I remember using a program called Trillian (which is still around!) in the late 90s/early 00s. It allowed you to connect multiple IM accounts in one app. It was sorta finicky, but it got the job done.