I really, really, really love Path. In fact, just go to their website instead of reading any of this. Oh, unless you have 3D glasses, then check out my pictures.
Akin to Google plus, this is a highly designed, polished social networking product with minimal adoption. I say minimal, when there are probably several hundred thousand users. The smart thing about Path, if you don’t know about it already, is that it’s semi-social networking. Or probably a better way to think of it is: imagine Facebook if instead of 500 “friends,” you only had 20 or so real friends, and the app was beautiful to use and had a photo-sharing mechanism that made you forget about InstaGram.
iTunes link – Path (free)