I think it is very difficult to show one's true self in writing: it inevitably leaves time to reflect and present an aspect of oneself, while in face to face interaction facial expressions, tone of voice, body language, all add to - or sometimes confuse or even obscure - the spoken communication. Also, in writing one is not seen - and even in pictures, not seen so 3-dimensionally, so can select a favourable angle or a good picture present, to show a good aspect or to hide a defect. I quite like this, in fact, because I find face to face social interaction often confusing and tiring - and I have a skin condition that many find disfiguring that I can hide behind the relative invisibility here.