Facebook Experiments Had Few Limits

Inside The Facebook Team That Manipulated Users' Emotions
File - In this April 30, 2014 file photo, Facebook CEO Mark Zuckerberg gestures while delivering the keynote address at the f8 Facebook Developer Conference in San Francisco. Zuckerberg and his wife, Priscilla Chan, are donating $120 million over the next five years to the San Francisco Bay Areaâs public school system. The gift is the biggest allocation to date of the more than $1 billion in Facebook stock the couple pledged last year to the nonprofit Silicon Valley Community Foundation. (AP Photo/Ben Margot, file)
File - In this April 30, 2014 file photo, Facebook CEO Mark Zuckerberg gestures while delivering the keynote address at the f8 Facebook Developer Conference in San Francisco. Zuckerberg and his wife, Priscilla Chan, are donating $120 million over the next five years to the San Francisco Bay Areaâs public school system. The gift is the biggest allocation to date of the more than $1 billion in Facebook stock the couple pledged last year to the nonprofit Silicon Valley Community Foundation. (AP Photo/Ben Margot, file)

Thousands of Facebook Inc. users received an unsettling message two years ago: They were being locked out of the social network because Facebook believed they were robots or using fake names. To get back in, the users had to prove they were real.

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