"Now, a new breed of social media networks has emerged - one that uses blockchain technology to build platforms enabling users to control their data and escape the censorship imposed by the likes of Facebook and Twitter. In addition, these new social networks reward users with cryptocurrency.
One such new social media platform is Steemit , which runs on top of a decentralized network known as Steem. Steemit rewards users with its own cryptocurrency in addition to social currency. Much like Reddit and Facebook, Steemit uses its incentives to encourage users to post, share and react to content."
Source: http://www.nasdaq.com/article/the-intersection-of-social-media-and-the-blockchain1-cm790707