I wonder if it might also help if companies were compelled to share specifics. E.g. Imagine just like the "Security" tab in $WEBSITE that lists all your recent logins and originating IP's, there were a "Privacy" tab showing each disclosure.

  7/2: We told Facebook you visited our website
  7/3: We shared your recent search on "Ukraine" with Cambridge Analytica

Even more-so if you could audit your telemetry data blockchain-style as it propagates through the ether...

  7/14: Cambridge Analytica shared your Ukraine search history with Russian FSB