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The safest thing would be to assume that you don’t have ANY online privacy. But Tor certainly does help. The NSA or CIA or whatever over-shoulder-looking agency can probably see what you are doing whether you are using Tor or not, but it’s not going to be as easy, and the average “bad guy” is not likely to have the expertise, tools, and/or inclination to break through your Tor given anonymity to see what kind of deviant behavior you engage in while you think no one is looking.