Another breach hits FB, despite vow to protect data: Will users lose faith?

The latest breach is very different than the crisis earlier this year that forced Zuckerberg to testify in Congress

Facebook Inc’s worst security breach ever is a major blow to the company’s effort to rebuild trust with users of the social network after a privacy scandal in March.

A hacker -- or hackers, as Facebook doesn’t know the number -- exploited several software bugs at once to obtain login access to as many as 50 million accounts. That access let the intruder act like users on their profiles, or on any applications where they signed in using Facebook.

Facebook has since solved the vulnerability, but it doesn’t yet have answers to crucial questions. It’s unclear what the hackers did with the