As def_true_false mentioned, the way keybase handles things would be what I was thinking, but the crypto doesn't have to be as strong, nor the workflow so elab

As def_true_false mentioned, the way keybase handles things would be what I was thinking, but the crypto doesn't have to be as strong, nor the workflow so elaborate. And for those mentioning gaming, HN does pretty well against all but the most sophisticated and motivated. Browse with 'show dead' on you can see there are plenty of attempts. A link to their profiles on HN and reddit would allow for review of their comment histories in order to determine authenticity/ how closely tastes align. Even Amazon could allow us to filter reviewers by review history, or other such criteria. Edit: You are probably right about allowing other identity providers, but the idea was to minimize the addressable market in order to study the dynamics of such a platform. Your comment definitely made me think of it as a possibly viable idea, thanks!