We told you so back Here
Now, go read this article
For the love of Pete, employers need to get a social media policy for your business. Don't just make one up, either, but make sure it will hold up according to the law. Yeah, that will cost a little bit of money. But better that, than learning things the hard way, in a lawsuit.
If you are an employee who utilizes social media, then be sure of what your company's policy is. Is it wise for you to mix business and pleasure—ie, are your coworkers or clients your friends or followers? Can you even mention who you work for? What about mentioning coworkers or projects? Find these things out before you potentially find yourself in a lawsuit.