patrick.net

Google DoubleClick/Authorized Buyers is installed on 8.4+ million websites.[12]
It broadcasts personal data about visitors to these sites to 2,000+ companies, hundreds of billions of times a day.[13]
The data can include people’s locations, inferred religious, sexual, political characteristics, and what they are reading, watching, and listening to online.[14]
There is no control over what happens to the data once broadcast.[15]
This appears to be by far the largest leakage of personal data ever recorded.
Google’s sole means of protecting RTB data once broadcast is a weak policy that asks the thousands of companies it shares data with to self-regulate.[16]