I'm naturally distrusting of everyone, online and offline, until we become friends or I see a reason to, such as a good personality, same interests, etc. So the ones I trust the most would be my closest friends, of course. xD
On the other hand, I could see myself as one of the most trustworthy people someone could ever meet. I keep promises and secrets to the grave. But I just wish others could see it that way. I don't know what it is about me, but it doesn't seem like people want to trust me. :/