Summary Box: Facebook rolls out security features

Users can request an alert when their account is accessed from a device they haven't used before. And when Facebook notices unusual activity, it requires users to answer some questions before the second login goes through.

Users can request an alert when their account is accessed from a device they haven't used before. And when Facebook notices unusual activity, it requires users to answer some questions before the second login goes through.

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When Available: Some changes are already available, while others will come in the next few weeks. Not all users will get them all at the same time.

The Backdrop: Facebook has been facing criticism about how it handles users' privacy. The security improvements show Facebook's efforts to maintain users' trust in the way it handles private data.