Instagram = photo sharing app Snapchat = chat app Pinterest = photo sharing app They are not social networks. They have social elements, but that's not their

Instagram = photo sharing app Snapchat = chat app Pinterest = photo sharing app They are not social networks. They have social elements, but that's not their core design. And none of them are FB killers. Google+ and Diaspora are examples of social networks, but they couldn't solve the network effect problem.