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Zuckerberg: Feed changes reduced user time spent by 50 million hours

Facebook CEO Mark Zuckerberg delivers the keynote address at Facebook's F8 Developer Conference on April 18, 201 in San Jose, California. Photo: Justin Sullivan/Getty Images

Facebook's recent shifts away from viral content, news, and video are already having an impact, said CEO Mark Zuckerberg as part of the company's latest quarterly report.

Why it matters: It's been a year of reckoning for the social network, which has had to deal with its influence over people's news diet and sharp criticism over its ability to exploit human psychology for attention. These forces led Facebook to change the newsfeed algorithm to focus more on content posted by friends rather than publishers.