No, no! Don't do it by population distribution! The rural areas are what I want to see! Ahem . . . I mean, the random distribution ensures that everyone gets to see things they weren't looking for, and that's good.
OK, it seems that guys from cities want to see country sides more often and the guys from country side want to see cities and people. I guess the randomization engine should be biased to use the location of the user & serve him what he does not see very often.
http://randomstreetview.com/#13i9ir_-2hkyi5_-5r_a_-2