> Many fake reviews are blatantly fake, and could easily be flagged by a relatively naive set of heuristics. Yes, that's true, but I think this is a question

> Many fake reviews are blatantly fake, and could easily be flagged by a relatively naive set of heuristics. Yes, that's true, but I think this is a question of scale. Amazon is the world's largest e-commerce site (well, I think they're #2 after Alibaba now) and I've worked on some of the world's largest sites. Even "trivial" solutions become much harder at that scale.