Facebook co-founder and CEO Mark Zuckerberg popped up on "Saturday Night Live" tonight. The guest host was Jesse Eisenberg, who played Zuckerberg in the movie "The Social Network." Watch a video ...

[SNL finally equalled its Tina Fey-Sarah Palin encounter with a live on-screen meeting between Jesse Eisenberg, Andy Samberg-as-Mark Zuckerberg, and Mark Zuckerberg himself during the monologue.