How to remote logout from facebook or gmail account

Resently facebook rolled out this new feature for security purpose. Every thing on facebook and gmail is maintained by session and if your session expires then you have to login again. Facebook and gmail uses this small technique to make remote logout available to you. Steps for remote logout are : In Facebook, click on the tiny gear sign on the top right of the page, go to 'account settings' and then to 'security' on the left pane. Under 'security settings', click on 'active sessions'. No one else might be using your account, but you would not have logged out of Facebook, leaving the session active. Anyone can gain access to your account in such circumstances. To remote log out, click on 'end activity'. In Gmail, at the bottom right side of the page, you will see details of your latest email access. If someone else is simultaneously using your account, you will see a notification there. Click on the 'Details' link below it. A new window opens, with a notification on whether the account is simultaneously open elsewhere. Like in the case of FB, you might not have logged out of the account, leaving it active. If so, you will see an option to 'log out of all sessions'. It also shows you the details of your previous 10 accesses to the account.