What's wrong with all those dating sites?
neilk: There's nothing wrong with the dating services. The people are broken.People lie. Solve that one and you may have something. (True.com tried to do this.)Also, most dating sites act as a sort of amplification for the user's dating filters and skill at attracting interest. However, I believe that most people are lonely because their dating filters are broken, and because they have trouble attracting interest. Dating sites only help these people 
fail faster and at greater scale.(Exception: tall women. They are not necessarily damaged, they really do have a sort of search problem that is more solveable at scale.)I have started to think that a really successful dating site would start from the premise that the user is broken and cannot be relied on to find or choose a partner. Maybe use social networks so that their friends help them find someone? Or even anonymous strangers, for karma points? Straight women do this sort of thing anyway (straight guys tend to use these sites alone) and if a woman gets all her female friends to come on board, that helps solve the female-male ratio.