A system where I can mark other people as trusted and see who they trust, so when I navigate to a web page or in this case, a Github pull request, my WoT would tell me if this is a trusted person according to my network.
A curation network, one which uses SSL-style chain-of-trust (and RSS-style feeds maybe?) seems like it could be a solution, but I'm not able to advance the thought from just being an amorphous idea.