[wildsatchmo]

Twetch is an experiment in exactly this. Pay to like, comment, "branch" as they call it (retweet). pow.market is another fascinating experiment using proof of work as the currency that could be integrated into these platforms. ctzn.network is another take but no payments going on there. "Karma as a token" is what I think of based on your description and it's really cool. I think in the next couple of years there will be a lot more experimentation in this area too. It's a perfect storm of censorship, bots, and fake news that are encouraging more experiments now. There are others I'm aware of that are not yet public that I'm most excited about though. It's definitely happening.