Instant Messengers
Also if you use, any kind of instant messengers, you should have a firewall on your pc. Many hackers can get through by these programs.
I am not sure about all of them, but I know I have heard of hackers doing it through ICQ. So just keep your pc, protected so we can keep posting the gospel of Jesus. Don't need the devil putting us out of the way by getting us a virus and shutting our systems down. LOL