You asked why it was so easy to be open, engage in a lot of back & forth, give & take online versus in real life....
One thing I've discovered about myself in the last few years, is that I express myself better through writing than by talking to people. HOW ODD, I thought at the time. That must make me really messed up! What I finally understood about this, is that (and I can trace this back to living with insanity in the FOO)...
is that interaction at that level happens very quickly. Emotions can be involved, too. Depending on the situation - several people compared to a large party - I simply don't have a lot of practice processing that much interperson "information" and since I'm inclined to avoid playfulness - and that whole form of self-expression... often, I take words at their face value, too seriously, misunderstand and am easily confused or susceptible to the social "faux pas".
Because of the FOO-experience, I am looking for authenticity; genuine emotion; the masks versus the real people... the content vs. the motivation... and gee! How many times did Dr. Jekyll turn into Mr. Hyde? How many times was I given contradictory rules, within in which to be safe? How many times did I experience that being simply wasn't safe or accepted?? That's TMI - too much information. Instantly - my own predilection to experience the world this way - creates my own awkwardness. I feel out of step... too fast... too slow... it's exhausting. And since therapy, the healing I've done here on the board is such a big, important experience my life (just like FOO was)... it also becomes like a camera lens or filter through which I'm looking at the world... sigh.... MORE INFORMATION.
So, I can indulge my ability to express all this crap in my head online with you all - and you understand. Not everyone has had these kinds of experiences. It's a safe environment, too. If you don't understand you ask questions, challenge ideas, suggest new ones -- all over the space of hours and days - even some threads resurface after months and years. You have time to process my tortured thought processes... twist it around look at it from 3-4 sides... and then respond. It's a slower pace - and it allows ROOM for more genuine, authentic interaction. Discussion boards in particular (versus chat rooms) have proven to be the educational equivalent and extension of the socratic method of in-class graduate school discussions of case studies. They are ideal for students, where English is their second language because of space allowed to process the information and then respond more appropriately, and completely.
Human interaction, face to face, involves body language, emotional subtexts, inside jokes..... so many, many things going on so very quickly. When I'm feeling more secure in my ability to surf life... I let myself practice being in that environment and experience it a little at a time. I do frequently allow myself "time outs"... to drop out of conversations, to sit quietly... to talk to only one person at a time. Some days I feel like surfing life - playing - staying on the surface of relationships and life. That's OK. Somedays I don't enjoy it one bit and don't have the
energy. That's OK too. I don't feel there's anything strange about enjoying solitude or solitary pursuits: reading, art, hobbies... research

Starting to ramble.... I just wanted to answer your question about this way of relating to people.