Hasan Elahi is an American citizen with a Muslim name. He's a digital artist and a professor at the University of Maryland. In 2002, when he was returning from an art exhibition in Senegal, U.S. immigration agents detained him as a terrorist suspect. Elahi was turned over to the FBI, and battery of interrogations followed. Elahi struggled to prove his innocence, though nine polygraph tests proved he did not speak Arabic and had no knowledge of how to manufacture explosives. Ultimately, his incredibly detailed accounting of his whereabouts, which he compulsively tracked with his PDA, helped Elahi walk away with his freedom. To this day, his name has yet to be fully cleared.

You've got something you want taken offline: a drunken Facebook photo, an ill-advised blog post about your flirtation with Satanism, a frustrated tweet you wish you could take back. As Facebook passes its 500 millionth user, we take a look at new proposals to reduce the threat that we users of the internet pose to ourselves. 

This week, New York techies are going offline and trying to meet up in real life. Takeaway digital editor Jim Colgan attended the third annual Internet Week festival, where companies like Meet Up and FourSquare were showcasing tools that get people talking to each other. Meetup's new tool, "Meetup Everywhere," helps any organization to get its members get to know each other. It's what Meet Up's founder, Scott Heifernan, says is "using the internet to get off the internet." To make his point, he smashed an iPad on stage. Click through for video.