The cyberattack exposed the user names and contact information for nearly 30 million Facebook users. (Photo: Gabby Jones/Bloomberg) The cyberattack exposed the user names and contact information of nearly 30 million Facebook users. (Photo: Gabby Jones/Bloomberg)

Facebook Inc. failed to fend off a lawsuit over a data breach that affected nearly 30 million users, one of several privacy snafus that have put the company under siege.

The company's disclosure in September that hackers exploited several software bugs to obtain login access to accounts was tagged as Facebook's worst security breach ever. An initial estimate that as many as 50 million accounts were affected was scaled back weeks later.

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