I'm trying to think how you would perpetuate your personal rep system on the chain. For a given post you can add JSON tags to each commentator and that would work fine. But doing that for each post would be cumbersome.

To keep a database on each user would also be cumbersome.

In this hypothetical condenser, you could publish a footer on each post that isn't displayed by the site and contains your reputation score of others. That seems like it would work, but it's sort of a brute force approach.