Well I'll just add me, cause I forgot! And anyone is welcome to message me, since I'm almost always at my computer!!
I like AIM and MSN, because there is no database that some stranger or stalker can search through to find you picked out of random people like a phone book (Or white pages if you will.) which is exactly what ICQ has, I had more strange people messaging me from like Jordan and Turkey wanting sex, then I had of my friends!
So in short, MSN and AIM provide or privacy, a person HAS to know details about you to find you, and even then you can use a fake name and another email address and they'll never know who you are.
And there is always the ability to BLOCK someone so they can't see you online.
Don't worry I have to hide from my father, like you do your mum.