It may actually be a good standard to not show your face on the internet. Unless you are really close to the one you are speaking to, showing your face is a feeble attempt to decrease the gap between your computer self and your real self.
Either that or it is supposed to further reinforce this idealized version of oneself. I wouldn't have chosen the photo I posted on this forum unless it made me look at my best.
The gap between the internet and real life is so large that I feel uneasy to just think about it. Picture that outside of this forum, none of us would have a reason to speak to one another.
Quite interesting.