I read an article earlier today that spoke about a Calgary woman's legal efforts to keep a bad review online. She had a bad experience at a dog kennel, and after they threatened her, removed it. Then a video came along with this kennel abusing another animal staying there. She re-posted her review, and they tried to sue her for Defamation.
http://www.ctvnews.ca/canada/dog-own...line-1.2420908
She's won the lawsuit (you can't defame someone if you can prove they have wronged you) but apparently this is enough of a thing that lawyers have a snappy name for it, a SLAPP (Strategic lawsuits against public participation) lawsuit.
I wonder if we'll start seeing more of these, as generally the mere threat of legal action is enough to back someone off.