It's a strange time for people who like to post reviews on the Internet. In the past, you'd review a hotel, restaurant, service or product online and move on.
Now, you can't load a news page without a story of a company going after someone for a negative review. There's the hotel that fined a patron $500 for a negative review. After a round of Internet outrage, it dropped the fine and apologized.
Another gentleman - with near-terminal cancer just to make things worse - posted some negative reviews of his Internet provider and it decided to sue him. Again, the suit was dropped within a day after the story spread online.
Still, not everyone is so lucky. Some companies are a bit more tenacious with fines and lawsuits. It makes knowing what will and won't get you in trouble online tough.