Everybody who uses the Facebook-app agrees that his/her entire phone book is uploaded to Facebook. This means that even if you're not using Google, not using WhatsApp and don't have a Facebook-account, your name, phone number, birthday and likely your address is already in Facebook's databases as soon as one of your colleagues uses that app - and this WITHOUT even asking you if you agree with Facebook having your data - thank your friends for uploading your data without asking you first. If there are more than two or three of your friends who use the Facebook-app, Facebook is already able to profile you pretty good according to your friends, their friends and all their preferences - without asking you for any agreement for this profiling. Comparing to that, I prefer Google's style of data-collecting since they show you very transparent that and what data they are collecting - and you still can opt out (or even have to opt in in first place) from everything. The true "privacy-enemy" are Facebook and similar, not Google...
"If you have something that you don't want anyone to know, maybe you shouldn't be doing it in the first place. If you really need that kind of privacy, the reality is that search engines—including Google—do retain this information for some time and it's important, for example, that we are all subject in the United States to the Patriot Act and it is possible that all that information could be made available to the authorities." Eric Schmidt.
Autotrader values your privacy. To help us understand how you use our site and to create valuable experiences for you, we may collect data about your use of this site directly and through our partners. We want you to know what information we're collecting. We also want you to have control over that information, which is why we're providing this tool. To learn more about Autotrader data policies, please review our Privacy Statement.