Most people who are setting up a social media account or downloading a new app hit the “Agree” button for the terms of service agreement without even reading it. They have a vague idea that they’re selling off parts of themselves. The illuminating Web documentary “Do Not Track” will give them a clear of idea of just how much they’re giving away — and to whom.

“Do Not Track” is an international effort, produced by the French production company Upian, the National Film Board of Canada, the French/German public broadcaster Arte and German public broadcaster Bayerischer Rundfunk.