Silicon Valley wonders who is behind mystery NSA billboard

As if Silicon Valley's relationship to the whole National Security Agency spying-on-the-Internet thing wasn't awkward enough. Now someone has placed a slogan on a billboard over Highway 101 near South San Francisco that reads: "Your data should belong to the NSA."

Guessing the identity of the organization or person behind the sign has become one of Silicon Valley's favorite parlor games in recent days. Of course, it's possible that despite creepy, Big Brother-ish overtones, that it's the NSA itself just trying to get some good marketing. Others have wondered, could it be the work of Michael Arrington, erstwhile blogger-turned-venture-capitalist-turned conscience of Silicon Valley? Arrington has been on a one-man crusade to shame valley companies that have been assisting NSA efforts. As Arrington recently said on his blog: "I'm scared of our government and I'm disgusted by what little Silicon Valley has done to fight it."