While Facebook boasts over 500 million members, apparently not all of them were interested in watching a film about how that site came to be. Even so (and of course we need to take into consideration that it's only been open for one weekend, and we're not including international audiences), The Social Network still managed to claw its way to the top of the box office with $23 million. Following behind in second place was Legend of the Guardians: The Owls of Ga'Hoole ($10.9 million), which just narrowly defeated last week's box office champ, Wall Street: Money Never Sleeps ($10.1 million).