Is our site different from the other StackExchange sites in the lack of users' pictures?
To your second question, it appears that the answer is yes.
I looked at the first page-worth of users (top 36 reputation-earners in the past month) on our site and a few semi-randomly chosen others. Here's how many photos including the user's (I presume) face I found on each:
- Jewish Life and Learning - 5
- Stack Overflow - 16
- Personal Finance and Money - 9
- Fitness and Nutrition - 18
- Literature - 12
I can only speculate about why this would be. Perhaps it's related to Judaism's emphasis on modesty.
A lot of our users like to remain anonymous, including myself. Putting up a picture would defeat that purpose...
Whether we have a greater anonymity rate than other sites is hard to tell, but if we do, "why?" would be a fair question to ask.