Mark Zuckerberg shows off what they've built after every Hackathon

Mark Zuckerberg shows off what they've built after every Hackathon After every Hackathon, teams show off what they've built. We're going Live so you can see too! https://twitter.com/markzuckvideos http://ift.tt/2i2KiTx http://ift.tt/2hTFQIO http://ift.tt/2i2SOBT