Facebook hits 400 million users

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As we noted earlier, Facebook launched six years ago Thursday. Capping a year of spectacular growth and celebrating the milestone, Facebook founder and Chief Executive Mark Zuckerberg published a special post on the site’s blog. In it he revealed the company this week has surged to 400 million users. It was only five months ago that Facebook had 300 million.

Facebook was holding a Hackathon at its Palo Alto headquarters Thursday night. Hackathons are a Silicon Valley tradition, during which engineers code all night in hopes of building some new must-have feature. The company will also announce a redesign.

-- Jessica Guynn