OK, first of all, I can try to explain some of this crap.
1) Don't ban Luffarn - this all started with a friend of me and my friend -SG- Blooztah [AD] getting hacked by this thing, which accesed their accounts and started spamming the link in all online friends private chats, so this is how it is spreading.
2) You can be online on the account even though it's hacked and it's logged in somewhere else, but you cannot connect to a game, or at least not a server because you will drop out due to multiple log-in.
3) I doubt LuffarN reads these forums, and as far as I know, he doesn't speak English too well, at least since he's from Sweden I speak Swedish with him, and we're good friends, but I don't seem to get answers from him if I write in English. I dunno really :/
And lastly, the only solution to get rid of the hack-thing is by changing Steam password.
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Also known as TheOwner24 on MineCraft.CaRIOcas 2012:http://www.youtube.com/watch?v=1M7SavzqdSM