Facebook on Thursday announced the launch of a new security feature that allows members to log out of any active sessions from a central control. The function is aimed at users who may have accidentally remained logged in when using a computer or mobile device that wasn't their own. However, according to a Facebook Security blog post, the feature also can be used to sign off individuals who may have gained unauthorized access to an account. The new tool complements a feature announced in May that allows users to approve the devices that can access their accounts. — DK