>AI doesn't solve the reputation problem

I disagree...

I create 'fake news' message among a series of bots and have a strong network there of social media accounts and sites. Ok, that's step one.

Now, I hack your account and steal your reputation. It appears you approve this message and some subset of your followers follow the bots and go to the bot sites.

You can try to pull out and say your hacked, and some percentage of people will unfollow said bots, but at the same time, a subset of those followers are now following those bots and giving them thumbs up thereby getting access to your friends friends.

User accounts are easily hackable as we saw with Linus Tech Tips recently. Reputation is just the newest currency worth stealing.