A social media platform on EOS would be much better from its distribution alone.
There is nothing else that even comes close to the power distribution EOS has right now. Token sale is still ongoing too!
A new platform that airdrops on EOS would see the end of distortions due to whale votes.

Also, I'm sure whoever builds this social network on EOS will be able to build something even better from the mere fact that many lessons have been learned by watching Steem(it) in action for 2 years.