Actor Jesse Eisenberg played Facebook founder Mark Zuckerberg in a movie. He must have done a really good job, because it seems lots of people think he really is Mark Zuckerberg.

Eisenberg's in London today checking out the U.S.A.-Spain gold medal basketball game, and when the cameras found him, NBC's broadcast team immediately remarked about "putting pictures on Facebook" and how all the big-name corporate leaders were in attendance. Tough luck, Jesse, it sounds like your net worth just went down a few hundred mil. [NBC]