If the website has community-written reviews, you can destroy it by soliciting bribes from the reviewed businesses:
With the Web site Yelp still responding to allegations by San Francisco businesses that it manipulates the prominence of positive and negative reviews, some Chicago merchants are adding to the heat.
They allege that Yelp representatives have offered to rearrange positive and negative reviews for companies that advertise on the site or sponsor Yelp Elite parties.
Yelp's CEO Jeremy Stoppelman has been taking his side of the story in this controversy to the Web, the media and even Twitter.
In a conversation with the Tribune, Stoppelman denied the allegations, saying, "I guarantee that there is no link between" review placement and advertising. He said that the people selling the ads have no access to the architecture of the site and so cannot influence placement or review content."
This bears investigating. Check out the original story in the East Bay Express, too.