Facebook has seriously hit critical mass … In the last month I’ve “friended” more people that I went to high school or college with than I did in the previous year. I’ve been on Facebook since it was only open to college students and teachers (I used to teach a few classes online). They opened things up about a year ago and it has just now finally exploded.
If you haven’t joined yet, you should … It’s been very cool to reconnect with people from my past — and Facebook does a great job of helping you find people that you “might know” by looking at your profile (where you went to high school, college, friends of friends, etc.)
I expect that sites like Reunion.com and Classmates and similar sites aren’t going to last too long.