They go way back; they've known each other since they were kids, I think. Jeffrey has known most of his friends since childhood too. Me? Not so much. I'm not really friends with my childhood friends, despite what Facebook may say. I've always been great at making friends but not so great at keeping them. They either make new (and apparently better) friends, or we just move on with their lives. I really hope this isn't a pattern. If it is, then who will be my Ghostbuster? (I don't even believe in ghosts.)
Also, most people from back in the day don't know what social media beyond Facebook (and MySpace, but I stay far away from that) are. If they did, I'd be either more inclined or less inclined to interact. Even Twitter would suffice.