◼ Careful what you tweet: Police, schools tap social media to track behavior - NBC
...As social networks continues to look for ways to make money, the potential for providing direct access to the information we share publicly online is unsettling. Consider Facebook, and its infinite database of publicly shared photos on the Internet. In August, the social network announced that it might add profile photos to its facial recognition database, to aid in photo tagging.
"Can I say that we will never use facial recognition technology for any other purposes? Absolutely not," Facebook Chief Privacy Officer Erin Egan said in a statement.
Of course, like all social media, you can opt out. At least for now.