Summary Box: Yelp under fire in business' lawsuits  THE
ALLEGATIONS: Since late February, at least three lawsuits
seeking class-action status have been filed against Yelp, a site
that asks people to review businesses. The cases claim that
reviews on Yelp are manipulated, depending on which companies
pay to advertise on the site and which don't.  WHAT YELP SAYS:
Yelp denies the claims. It says reviews can come and go from a
business' listing on the site because it uses an automated
program to weigh reviews and filter out ones that seem
untrustworthy.  WHAT IT COULD MEAN: If the cases stick or are
followed by more, they could taint Yelp's reputation as a leader
in online reviews.  The Associated Press