I believed that provided participating in instructing society you should be frank. Some one have not picture on their profile! I think they are afraid of some thing like their appearance , peoples judgment and recognition!
On the other hand, They believe instructing not needs recognition!
But, I think it will help others truth you for having moral communication
Are you comftable with hidden user?
Faces may be forgotten, words not.
I perfectly agree with you. Showing picture on profiles is something personal. Words speak louder than faces.
Mabye, you are punctilious.
I agree with Jura. Some people do not like to be known. And everybody has own reason. I myself rarely feel comfortbale with them but what can I do? At least we can feel their honesty from thier words. Maybe we should see them with the eyes of our hearts.