How to Log Out all your previous used FB Accounts?

Here’s what you do:

• Sign into your Facebook account, click the downward arrow in the top-right corner of the page, and then select Account Settings.

• Click the Security tab in the left column, then click the “Edit” link next to “Active Sessions.”
• The first session listed (“Current Session”) should be the computer you’re currently using; beneath that, you’ll find a list of other open Facebook sessions, complete with approximate locations, times, and device types.
• Take a look at the list; see any Facebook activity that look suspicious? Or did you spot the work PC that you used for Facebook but never logged out of? If so, click the “End Activity” link, and you’ll instantly be signed out of that particular session.