I remember when MSN got shut down, I was kinda sad, I still used it (via Pidgin) to chat with some friends, and also lot of internet friends where it was the only contact method I had. Then they pulled the plug so I lost contact with lot of those people. Mostly old guild members from UO and such.
Come to think of it, is there even any IM services left now? I guess there's FB, but I don't really count that one as FB is more of a family/IRL friend thing, you don't go giving that out to random internet people, typically.