I understand that some people do actually get hacked, but I'm pretty sure at least 50% of hacking reports have been because they've told someone their password.
I'm not saying any of your friends did, but just make sure never to tell anyone your password, even the people you trust the most, because you can never really trust anyone fully.
Also, you say you've never been hacked, but what's with your signature huh? Big gaping contradiction right there.