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Facebook Hackathon; Mark Zuckerberg showing what his team has built.

Hackathons are a big tradition at Facebook. They serve as the foundation for some great (and not so great) ideas. It gives our employees the opportunity to try out new ideas and collaborate with other people in a fun environment.

Mark Zuckerberg made a live video, showing what his team has made in Facebook Hackathon. He had Facebook Hackathon at his office.