It can be difficult to trust another person online as you do not truly know their intentions. However: this actually makes me feel slightly more comfortable because at least this way you know where you stand with them, and you know to be cautious. As opposed to people in the real world who you are expected to trust but will not always value it when your wall is down.
Sanctioned Suicide is a perfect example of what I am trying to talk about. The majority of people here are unknown to each other, but this gives everyone anonymity, so it is easier to talk about more sensitive issues, or anything at all; your business stays your own because it cannot be pinned to an individual. This is why I am more trusting of strangers online - here - than in the real world.