[spottiness]

Amazon is a good example where "real name" reviews cause a bias towards positive reviews. I believe that most people are reluctant to write negative reviews if their real names are associated with it, even if the fairness of the review is not in question. Negative reviews always put a negative halo on the reviewers, so good reviews are overwhelmingly more common. Curiously in our site, where anonymity is a requirement, also the positive reviews dominate by far, which is indicating that there's much more good than bad in the world. Cool!

[marze]

"in our site, where anonymity is a requirement, also the positive reviews dominate by far, which is indicating that there's much more good than bad in the world"

Or indicates a lot of fake reviews or something in between.

[spottiness]

You mean a lot of "positive" fake reviews, in which case people tend to fake positive opinions much more than negative ones. Definitely better than the opposite...