I can usually be found on IRC, nick "cos", on EFnet, Undernet, and Dalnet. I have a second journal, cosmusic, where I post about bands, concerts and shows I'm going to or want to recommend. And I post links I think are interesting or amusing on coslinks - about 0-5 posts per day, almost all one-liners. No userpic, no commentary, just links, so they take up very little space on your friends page.
Everyone is welcome to friend me and read my journal.
I usually don't friend people unless I know them in person (though I also don't unfriend people after in-person contact fades away). If you add me and I don't add you back, it's probably because either 1) we don't know each other well or in person, or 2) I can't tell who you are from your LJ userinfo. I won't spend much effort trying to figure out who you are, so if you want me to know, and your userinfo is enigmatic, tell me. Don't worry about it, though - I don't post anything interesting friends-only. My very rare friends-only posts are all of the "help, I need a ride to X tomorrow" sort.
You probably don't want to read my whole friends list. Way too many journals there. But even if you don't know any of them, you may want to read these.
My schools list includes two I didn't attend: Burr School: I was a student teacher there in 1993, 5th & 6th grade (mixed) Wellesley College: I half-lived there with my girlfriend, so socially I sort of attended, and would like people who were there at the same time to be able to find me this way.