snooping cell phone pictures via URLs?

I received a few URLs pointing to cell phone pictures stored at pictures.sprintpcs.com. The URLs contained long seemingly-random strings, though with my sample (of 2) I only saw 5 identical characters in the same locations. Has anyone done any less casual cryptanalysis on these kind of URLs? One wonders how much protection from (non-sprintpcs.com and ISP) snoopers that the "random" strings actually provide. ---- A fool and their bits are soon mirrored worldwide.