I honestly don't understand people's opinion around this. I'm not trying to refute your comment, just understand and see if I missed something. As far as I have read, Google complies with NSA letters (which seems to be required by law, although perhaps not a favorable one) and PRISM is said to give the NSA additional direct access (but I haven't seen any indication of this being proved or confirmed to be known to the companies involved). Has there been some information proving Google and other companies are actually working with the NSA or is it simply based on the idea that you think it might be likely and they'd deny it either way (if they confirm it, they work with the NSA and if they deny it, they work with the NSA).

I'm not suggesting blindly trusting any company or person but do we have actual knowledge in this subject I missed or simply opinions?