Yelp.com - they have been accused of extorting small businesses, insisting on a monthly fee in order to suppress negative reviews.

A Long Beach veterinary hospital, for example, was threatened to pay $300 a month for a year to suppress or delete negative reviews. When the hospital declined, negative reviews immediately started appearing in droves. One review referred to the Dr. Perrault as an "ass", "a jerk", a DBag," and so forth. Other companies have noticed that negative reviews surface to the top of the comments section moments before receiving a call from Yelp Representative to "fix the problem."

So Yelp reviews are largely biased in favor of those companies that purchase Yelp's advertising schemes.

FFXU has no interest to make money. The only downside is people can post as guest and you cannot see their account history.