Tinder's swipe mechanic, while incredibly superficial, helps with the biggest problem with OkC and other traditional dating sites: The experience is horrible for women. Their inbox receives a torrent of marriage offers and incredibly explicit sex offers from men they have no interest in. Tinder's reciprocality system, where you both have to show interest before a chat is even possible, solves this elegantly. The downside IMO is that it's incredibly hard to find someone that you have more than a physical interest in. OkC's matchmaking questions and match% system is actually a really good solution to this. I think there's a business opportunity in combining the two - enforce the reciprocality like Tinder does, but have matchmaking questions, so it can try to pair you with more likely matches first. (OkC actually has a feature like this, but when they don't enforce its use, it's entirely meaningless). Of course this would begin compromising Tinder's other big advantage, the incredibly easy setup (it doesn't really _feel_ like making a dating profile, so it attracts a much wider audience) - but I think it'd be worth experimenting with nonetheless.