CEO Mark Zuckerberg's sister is known for her lipdubs, after all, those annoying ersatz music videos uploaded to the internet. She moved on to real music when her ad-hoc Open Source Band played a recent Silicon Valley fundraiser. And now this performance, which nicely leverages her social network's prominence into more attention for the accused social climber. "The voice of social networking!" one critic raves. By that standard, we could do far worse than Zuckerberg. But that ain't saying much.