Should sites include a log out of everywhere button?

I was just thinking about logging out of facebook on my work machine (i have to use it occasionally to check things work on our website) and i was thinking why isn’t it a standard thing to build a ‘log out of everywhere’ button on websites.

If i accidentally select ‘remain logged in’ on a computer that isn’t mine, or my parents or friends machines wouldn’t it be useful to be able to select a ‘log out of everywhere’ option to remove these instances.

Sitepoint, for example, is ‘remembered’ on my work computer and home computer, but what if i was at home and wanted to ensure that i had logged out on my work machine. Is this possible? I guess i could change the password.

Or am i missing something simpler?

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