I was doing some reviews of first posts earlier when I got this question as a test (with a random username, of course):
What is the difference between using '+' (plus) and ';' (semicolon) in -exec command?
I recognized @kasiya's picture from the test (it said something like user### but then with that picture), so I immediately knew it was a test.
With some of the other high rep/active users who have recognizable pictures (oli, rinzwind for example) this could be detrimental - passing tests based on pictures, not quality of the review. For the tests could we have it pull, for example, someone's gravatar?