I feel like there's no real need for this sort of information to be available to everyone:
http://www.gstatic.com/s2/sitemaps/sitemap-7000.txt
Since Google hosts gstatic.com, I feel like they should have the knowhow to not allow this information to be available. Also, if you change the 7000 number from anywhere in the 1000s to 7000s, it seems to give you another list of 5000 fresh profiles.
Why on earth would Google make this information publicly available? As a Google+ member, is there reason to be concerned?
Thanks in advance.