As I see it, right now there is an opportunity window for a P2P hosted social discussion platform. That's because many big social media companies have been increasingly cracking down on user submitted content, leaving a lot of people to wonder where they could participate without having all their content at the whims of some commercial third party, which can be bullied to censor/delete by state actors at any point in the future.

One could argue Thor offers such a place, but imho in terms of usability Thor is far off from something everybody can use easily.