I know many much smarter than myself insist this is so. While I'm ignorant on much of this, I think it is safer to assume that since we are using their equipment, with known back doors, that they see everything. I also believe those in power are smart enough to not tip their hands on what is possible for them to do. Smart power will create areas that appear safe for those whey would control, and I see no reason why that principle wouldn't be applied here.

I also wonder if their supercomputers can break encryption (although it seems with their back doors they can record it before its encrypted). While its entirely possible you are right, I will proceed as if there is no privacy from their eyes when conducting myself through the tech they allow the public to use.