Hmm, mainly send messages to my friends.
You know how if you have usernames for a Windows XP Home Edition computer, you can send messages to those who are logged in by pressing ALT+CTRL+DEL and then clicking on users, then you create a message, and send it, and when they go to their user they see it? Something like that, except a connection through an IP address.
(I would never use this to solicit to people I don't know, because they would for sure BOMBARD me with replies. I wouldn't like that too much, and changing an IP address seems like it would take too much work in the first place. )