For all the praise that brand advertisers have for social media, they must be aware that it’s very much a double-edged sword. And for all the free marketing, advertising and brand promotion via Facebook, Twitter, Foursquare, and other platforms used to help build an identity and relationship with your customers, it can just as quickly turn on you and your brand.
Social media disasters occur for a number of reasons, the first being that your company probably messed up. It may not have been intentional, but something, somewhere down the line, went wrong enough for someone to complain and it was enough for others to vocalize that complaint en masse. One mistake is all it takes for social media to turn against your brand.
Read more at Mashable for 3 great examples.