I'm a short attention span person, so the quick updates on Facebook are handy, and the photo-posting interface is a lot better than MySpace or Photobucket.

I don't know that I could "sell" it to somebody who knows as much about the technology and internet as you do, but I don't think that's who it's for. And I keep vaguely in touch with a ton of people I hadn't talked to in years (mostly people I went to HS/college with) because Facebook made it easy enough for them to find me, or vice versa.

(MySpace also just added a "people you may know" function, which is one of Facebook's biggest appeals I think)