There's a bit of a 'you've been framed' fascination with social media blunders I find. On the one hand you cringe and cover your eyes, on the other you want to see how bad it gets. The article linked to below gives us a few examples of both high-scale and minor blunders that can happen all too easily in the fast paced world of social media.
Blunders don’t have to be at the polar scale of monumental fail, there are plenty of smaller hiccups that can be made along the way which could cause just as much damage to your social presence and consumer loyalty. One of the most common mistakes that brands make on social sites is to forget that they should still act as a person and treat others as human beings, too. For example, if users like a brand´s page or tweet about it, they should be thanked. Or if there is an industry conversation going on, it could be a good idea for the brand to chime in and offer an expert opinion. Don´t be scared to show some brand personality.