Two words in Facebook's latest regulatory filing shows how worried the company is about what it's doing to people

Facebook CEO Mark Zuckerberg has talked a lot about making sure that users' time on his social network is "time well spent." After a year of headlines blasting Facebook for negatively affecting everything from mental health to memories, Zuckerberg was responding — and, he said, showing responsibility— to growing public concerns about the age of social media. But as Facebook revealed in a tiny but telling change to its latest quarterly report, the company also appreciates the very real threat these concerns pose to its business.

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