At yesterday's launch of video Skype messaging, Mark Zuckerberg showed this slide of Facebook user growth graph plotted with the launches of Facebook apps like Photos, Messages and the Like Button. Zuckerberg held that each bump in growth was fueled by a technological innovation and that Facebook is currently right at elbow of the hockeystick, waiting for the technological innovation that will propel it upwards.

When asked in the above interview what this innovation could possibly be (Project S [...]

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