Edmund Yong has rebooted the “Who are you?” meme. I’ll quote him:
So let’s do it again. In the comments below, tell me who you are, what your background is and what you do. What’s your interest in science and your involvement with it? How did you come to this blog, how long have you been reading, what do you think about it, and how could it be improved?
I will try and be a little less…abrasive…on this thread in relation to comments, so feel free to let your hair down and “de-lurk” 
That being said, I do take surveys of my readership periodically, so here are some of the demographic breakdowns which I have from a survey I took last winter….
-20% of the readership responded that they’d been reading GNXP for more than 4 years
-50% have at least a master’s degree (22% have doctorates, 11% professional advanced degrees)
-Nearly 50% of university degree holders who read GNXP have a background in science & engineering (science = natural science + mathematics)
-78% are atheists & agnostics
-60% have no religious identity
-70% live in the United States of America
-80% are of European ancestry
-86% are male
-35% are on the political Left, 30% on the Right, and 25% Libertarian
-60% have no children
-12% are virgins
-82% have taken calculus
The above includes both GNXP weblogs. The sample size is north of 600 (the omission rates varied by question).