Well, the U.S. just cut off Library Genesis (gen.lib.rus.ec), the presumably-unauthorized archive of math/science ebooks. It works great from European proxies, but not from here.
(My point is that if they tell you you're getting unfiltered Internet in the U.S., they're lying.)
(My point is that if they tell you you're getting unfiltered Internet in the U.S., they're lying.)