You can choose to not use Facebook and Google services, and you can use ad/tracker blocking browser plugins, and null their domains in your /etc/hosts file. Tha

You can choose to not use Facebook and Google services, and you can use ad/tracker blocking browser plugins, and null their domains in your /etc/hosts file. That would deny about 98% of their activity as far as you are concerned. You can't really control what your friends are telling them about you though. Personally, I've just about opted out of the entire internet except for work, email, and a few web sites that I read regularly. The flotsam is just too thick to be worth the bother.