@CNN: Mark Zuckerberg has taken the stage to deliver a keynote at F8, Facebook’s annual developer’s conference https://t.co/8X8RNUmZIn https://t.co/jZGb3QOt5V

@CNN: Mark Zuckerberg has taken the stage to deliver a keynote at F8, Facebook’s annual developer’s conference https://t.co/8X8RNUmZIn https://t.co/jZGb3QOt5V