Off the cuff solution: Require accounts be tied to a real identity (provide driver's license #?.. No I haven't thought about legal/privacy repercussions) and introduce a post-date rating system. Sprinkle in some sort of staleness algorithm along with an anti-maliciousness algorithm (IE: someone who always rates their dates as creeps might themselves be a nutjob) and perhaps the system can survive.
Off the cuff so tear this to pieces. Perhaps I just WANT the idea to work so well that I am not seeing the forest through the trees.
You'll eliminate the complete creeps after one date. (Still gives a woman a significantly nonzero chance of winding up with a complete creep on his first date anyway).
But you won't be able to eliminate those who are merely boring, or ugly, or abrasive, or have an annoying personal habit. Your rolls will fill up with people like these.
I've thought about that before, what trips me up is thinking about incentives. If you have a really great date with someone, chances are you don't want to increase your competition by giving them a good rating.
Off the cuff so tear this to pieces. Perhaps I just WANT the idea to work so well that I am not seeing the forest through the trees.