The social network that you know are:
We created a couple of Social Network on the blockchain. https://Steeming.com is based on STEEM blockchain, a decentralized social network.
and https://OnlineBuzz.com is based on HIVE blockchain, a decentralized social network.
Both social network produces additional PESOS digital rewards that you can earn while using the website for posting blogs, pictures, news, commenting, etc. Try it out and let us know what you think.