The news could weigh on growth and hurt profit in the second half of this year, according to Bloomberg Intelligence analyst Jitendra Waral. "Facebook also may lose users who have been asked to reset sign-ins" and face fines under Europe’s General Data Protection Regulation, he wrote Friday in a note to investors.

Everyone whose profile used the "View As" tool in the last year will have to log in to Facebook again, and any apps that used Facebook to log in. From there, they’ll be able to see a statement from Facebook explaining what happened. The company estimated that about 90 million people will have to log in again. Facebook has more than 2 billion users.

This article was provided by Bloomberg News.

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