So, benign online disinhibition. I've been more on the receiving end of it more than I am the one doing it. And sometimes one person's extra personal information just happens to be the first conversation starter. Ah, me. Well, I'm a trustworthy, non judgmental fellow so I tend to just listen, and I don't really mind.
TBH I don't think there's anything anyone online knows more about me than offline. I find it harder to relate to people online, which is weird given that ideally we should have more in common. I don't think I have any internet friends, at best I have many acquaintances. On the other hand, I tend to talk to a lot of my RL friends on Skype if I happen to be off campus. Does that count?
I guess to answer the question, offline folk know more about me than online folk do, and it's not even a preference thing. I'd be willing to share the same information either way, but I think too many people are distracted online to give anyone undivided attention, so it's just how it goes. It's not like I have any dark secrets or deep emotional scars. I'm pretty clean cut. Haha, that might be boring to some people, though. The only thing I keep to myself, though, are projects and ideas for projects*. My own family doesn't even know about those, and I trust them above all. Heck, I wouldn't tell my dog, if I had a dog to tell.
*Doubly true if said idea/project can make me money. $$$!