Is there a kind of application like Twitter based on the blockchain?
There is no such application
I think the blockchain would be suitable for such an app. Steemit and Qora have shown that a decentralized blog system works well with the blockchain. So why not a decentralized messaging app, too.
But can I ask you about where are the advantages of using the blockchain for the social media?
I was learning a lot from the matchpool project. Matchpool is similar to the tinder, but with lack of the advantages of his economic aspect by using the blockchain itself. If the tinder will allow the users with a single click and they can subscribe every block or channel for free, but on the matchpool project caused by the blockchain and it will divide every room, and the users must do a manual subscription to the room and users must pay more money.
Can you?