Aside from the unsourced "according to FujiTV they're still together" bit from wikipedia, I don't think anyone in the general public knows who he really is (if he's real at all). All the posts were collected by someone else, and it's public domain, so the companies took the story freely.
I'm not sure I'd want to know about the real guy. The story is most powerful as a modern day fable... at most, I'd like to know how he's going. shrug (Who knows, maybe we'll hear from him on the one year reunion special)
Funnily enough, the reason I found this place is because I was interested in an anonymous discussion board after watching this show. Regular forums are starting to annoy me, what with the names and personalities and such.
(sorry for the offtopic)