I have to assume that a similar thing could be done on Nostr with the review / label event that nostr:npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn is promoting.

Labels could add context on “viral” posts.

Accounts could compete for trust in their “fact checking” context adds I suppose. But X’s implementation seems to be better because it will surface the community note even if you don’t follow the person that made it