I like your progression from the initials form to the question marks.
This now is a symbol by which your clients will be able to recognize your site/company, without having to always read the words - think Coca Cola swoosh , Nike swish, NBC peacock, Chevy bow tie, etc.. Well done.
A small thought: as various computer monitors will render colors differently, you may wish to adjust the background color a little farther away (color or value) from the gold question marks, to keep the symbol shape stronger than the background
as noted by chging to B&W the gold ? is nearly lost
your just about there. good luck