In the published discovery chats of the recent lawsuit it was kind of clear that Musk rejects the idea of blockchain as fundamental tech for any type of social media. But I suppose this doesn't preclude payments etc.

The reason from what I recall was something like "social media on blockchain requires huge tech resources which means centralisation".

Basically the discussions were very similar to HN! Blockchain is totally the wrong thing to build big stuff around it but it has it's uses elsewhere