Facebook and Twitter in a kiosk environment... auto logouts?

I was wondering if there were any approaches recommended to auto logging out a user from Facebook and Twitter after they click a 'like' or 'tweet this'. I'm running a site in kiosk mode and would like to log them out after performing the previous actions.

Than开发者_如何学Goks, Steve

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At least with facebook, you can use FB.logout from their JS SDK or if using Connect, FB.Connect.logout(function() { ... });

With Twitter, it might not be as straightforward - see this answer.