Some people have reasons to do so to not reveal their names.
Freedom of a choice, I reckon.
Kiki, at least, you already know who I am when I revealed myself to you in P/M. Likewise, I will be more comfortable saying my last name if I have some direct contact with people in P/Ms instead of posting it in the "public"! I will bother to say my last name if someone is interested to know - ta-da!!!
