One (partial) solution would be to simply eliminate reviews. They're compromised. They aren't worth anything anymore and are just taking up bandwidth and bother

One (partial) solution would be to simply eliminate reviews. They're compromised. They aren't worth anything anymore and are just taking up bandwidth and bothering users. Not to mention fostering a weird little black market. Just make people research what they're buying elsewhere--which will probably also get swamped with fraud--or just let customers roll the dice without the false sense of security. They're already doing it, but with a bunch of fake 5-stars instead of a bunch of unreviewed items.