Facebook announced a security feature that will allow users to remotely logout from their account. The information provided for each active session will consist of the login time, device name (if one has named it), a ballpark location derived from the IP address, and the browser and operating system on the used device. This way, even if someone accesses the account after one or one’s account credentials get phished and used, one can lock out those users by terminating the session remotely and changing the password for the account. To check out if one can use it already, one needs to go to their Account Settings page and choose to change the Account Security.
More details :- http://www.facebook.com/notes/facebook-security/forget-to-log-out-help-is-on-the-way/425136200765
