Mark Zuckerberg is worried about sensationalism in news. He should look in the mirror.

Until recently, Mark Zuckerberg liked to think of Facebook as a basically innocuous social utility. But that view has taken a beating in recent months, as news shared on Facebook had a huge — and, critics say, pernicious — effect on the presidential election. In an open letter released on Thursday, Zuckerberg grapples with the implications of Facebook’s growing power. “For the past decade, Facebook has focused on connecting friends and families,” he writes. “With that foundation, our next focus will be developing the social infrastructure for community.”

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