I don't live on the computer, so I don't use messenger programs.
I'm on the computer 2 hours in the evening, which I have way more stuff to do than sit and play instant messenger. I read the forums of which I am registered at way too many of them (photography, RC flight, flight sim, of course here, my vehicle forums....)
Most of my computer using happens during the day at work, in which I can not install a messenger service.
I don't have any friends anyways
. No messenger, no cell phone, I have my wife and my kids and coworker friends. When I'm home, I'm doing something with the kids or I'm working on the house, the garden, or cars. No time for friends, real or internet.