It’s a story that will make your stomach turn via The Wall Street Journal:
The president of the chorus, a student organization at the University of Texas campus here, had added Ms. Duncan and Mr. McCormick to the choirs Facebook group. The president didnt know the software would automatically tell their Facebook friends that they were now members of the chorus.
The two students were casualties of a privacy loophole on Facebook—the fact that anyone can be added to a group by a friend without their approval. As a result, the two lost control over their secrets, even though both were sophisticated users who had attempted to use Facebooks privacy settings to shield some of their activities from their parents.
The chorus in question was a queer one. The story is a perfect example of why no one trusts Facebook, even users with an excellent knowledge of their privacy settings.