[mglinski]

It's a terrible hack, but changing your Skype password via their website does log you out of all active sessions within a 2-5 minute timeframe. A friends Skype got "hacked" via a third party botting a message to all of his contacts, and as soon as I changed the password the spam stopped and soon after his local client logged out.

[r00fus]

It's not a hack... this is exactly what is guaranteed for OAuth2 servers that follow spec to deauthorize all tokens.