a dating site may be a fantastic thing to try
So how would it be different from OK Cupid, for example?
As an aside, wasn't the original motivation for Facebook Zuckerberg's desire to meet girls..? :-D
Here is one improvement to OKcupid, which we might even be able to implement as a third party:
OKcupid has bad match algorithms, but it can still be useful as searchable classified adds. However, when you find a legitimate match, you need to have a way to signal to the other person that you believe the match could work.
Most messages on OKcupid are from men to women, so women already have a way to do this: send a message, however men do not.
Men spam messages, by glancing over profiles, and sending cookie cutter messages that mention something in the profil...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.