Out of the top of my head I could see :

- Micro-transactions to give incentives/disincentives to some behavior.

- Moderators team receiving compensation for their work

- Parties escrowing funds in case of moderation appeal

- A moderation implemented using smart-contract and not requiring third-party trust

- A multi-dimensional currency based on the cliques of reader who approved your messages much.

Why would you need a blockchain to do any of those things?

Please describe the exact mechanism by which a blockchain would be necessary for, or would enhance, any of these concepts.

All of these things are doable without a blockchain if you have a third party you can trust for not cheating in the moderation, in the handling of micro-transactions, for not being bribed by internal or foreign agents.

Look at the fire twitter/facebook are under: Dems accuse them of serving Russian interests, Reps of being pressured by "deep state".

A blockchain-based moderation would be immune to this criticism, the data and algorithm being laid publicly, for all to see and check.

Well, by using blockchain, you make whatever you’re doing infinitely cooler, thus attracting higher quality talent who can then do a better job moderating content.

Alternatively, I bet we could find a way to use a middle out compression solution to make moderation problems smaller.

I understand this is a buzzword that is overhyped these days and that by putting it next to deep learning I probably triggered many buzzword saturation thresholds.

I usually point out that there is only one thing that the blockchain bring: it removes the need to trust a third-party. If you don't need that, then you don't need the blockchain. I would argue that political discussion in the current climate is one of the cases where the absence of a third party of trust would be an advantage.