I think the whole idea of a "right to privacy" is misleading and destructive, since it places the focus incorrectly.
The question shouldn't be whether or not people have a "right to privacy," but whether or not other people should have the right to violate their privacy.
And the clear answer to that, IMO, is no.
So for instance, if you provide personal information to a website, the concept is that they have the right to do as they please with it unless and until you are declared to have a right to maintain the privacy of that information.
But I think that starts with a flawed presumption - the company should NOT have an inherent right to do as they please with that information. That information is not their property - it's yours. You shared access to it with them for a specific purpose, and the presumption right from the start should be that the only right THEY possess regarding that information is to use it for that specific purpose. You shouldn't need a right to stop them from doing any more with it because they shouldn't be seen to have the right to do so in the first place.
Of course that's not going to happen in our surveillence autocracy - the last thing in the world the wealthy and empowered few want is to have to make a case for a right to every abuse they want to pursue rather than being able to do as they please save for the bare handful of rights to be free from abuse that they grudgingly allow us plebes to claim, but still...