If you're receiving SPAM messages from your Facebook friends, don't blame them entirely. Spammers and hackers are creating applications which are asking Facebook users to enter in their Usernames and Passwords so that they can "authorize" applications and games to post to their pages. Well... once they have the credentials - they take over your account.
Facebook is adding a capability of Remote Log Out - so that you can see all the devices and connections logged into your account and "log out" specific devices and instances. This is also handy for people who store their passwords and then the preying eyes of roommates and family members simply go to Facebook have an automatic "in" to the site under your account.
Check out the article link for more details.
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