I could imagine a browser plugin which tells you if a company shares data with facebook (and other ad networks) before you sign up, make a purchase, etc. It cou

I could imagine a browser plugin which tells you if a company shares data with facebook (and other ad networks) before you sign up, make a purchase, etc. It could have crowdsourced data based upon these kinds of requests. I've wanted for some time to see a couple of variations of things like the Fair Tax Mark (https://fairtaxmark.net/ https://fairtaxmark.net/ - a cert that a company isn't using tax evasion tactics), especially one for privacy. FTM is trademarked and therefore able to police its logo's usage, a Privacy Mark could do the same, and enhance the market for privacy respecting services. Maybe it is time to start on efforts like these. Who'd be interested?