If you use Facebook - as I do - Facebook in all likelihood has a unique digital file of your face, one that can be as accurate as a fingerprint and that can be used to identify you in a photo of a large crowd.
You know, Lincoln was funny. I don't think F.D.R. was very funny. But Lincoln was funny. Lincoln was really funny. But I think you should get elected first, and then show that you're funny.
The institutions that we've built up over the years to protect our individual privacy rights from the government don't apply to the private sector. The Fourth Amendment doesn't apply to corporations. The Freedom of Information Act doesn't apply to Silicon Valley. And you can't impeach Google if it breaks its 'Don't be evil' campaign pledge.