Head over to https://wildspark.me/ for early access
According to its first announcement in March 2015, "Synereo offers tools allowing content creators to easily monetize original works without having to turn their channels into advertisement real estate, while granting their followers the opportunity to be rewarded for getting the word out."
On April 3, 2017, the team announced beta launch of Qratar, a social networking platform more or less similar to Steemit. Qratar has been renamed to WildSpark. It was the first stated crypto and social media platform but lost momentum against Steem. More about Steemit vs Synereo. Syenereo raised 500 BTC in its first crowdsale in 2015 and in a second crowdsale, raised $2m in six hours.
A few other de-/semi-/centralized services include: