Working on an IOS-based dating service which handles your facebook friends, mutual friends and soon to add searching capabilities, people within an 100m radius and people you would meet at events, it has several hundred users right now since beta-launch a couple months back.
Inspired because of things like this: https://news.ycombinator.com/item?id=16041292
Heres my IOS appstore link: appsto.re/ca/SfGTib.i
Please do check it out and provide feedback!