[YazIAm]

Indeed, currently all "verified" reviewers are manually vetted.

Long term the goal is to have an open reputation score for every fact checker. I'm currently experimenting with different implementations of this, and seeing good promise.

[scott_s]

How would the open reputation score mitigate bad-faith actors trying to exploit the system?

For example, I believe HN has a vote-ring detector, but I think there's also a decent amount of manual intervention from the mods. Amazon's reputation system is under constant attack through a variety of means (paying teams of people for fake reviews, going to the length of having real transactions on Amazon between fake-reviewer and the seller buying the review).