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Unreal Software Report - USGN hacker (stolen account) Server Administrator has written
Maybe hes computer got infected by viruses?
No, I don't see how is that related to account hijacking.
It's safe to stay logged in always - unless your own PC is compromised or used by multiple people.
I don't know, but hijackers are able to logged in as administrator (known as Fake-Logging) and check website's log, also doing idiotic acts.
If you're using a public/unprotected PC you should obviously always log out. Otherwise anyone using the PC afterwards can easily mess with your account.
@ DC: And my computer is not public-use and password protected computer. So it's safe isn't it?