LinkedIn gives a one click solution to logging out of everything, except that it isn’t the one-click that’s needed; you have to change your password and you will be logged out of everything.
Words of caution: Remotely logging yourself out from a browser is easy and every major service lets you do it. The real problem arises when mobile apps are involved so be careful about handling your phone and make sure you have taken reasonable measures to protect your data in case of theft.
