Google's surveillance system has more reach that Facebook's. Both are extensive, but it's pretty common to find webpages that contain no facebook tracking but do contain google tracking. In fact it's pretty rare to find websites that don't contain any google tracking. And I can avoid Facebook's gaze by using email, but if I use email almost inevitably somebody I want to email will be using gmail, meaning any messages sent necessarily go to google.
Then you've got the Chrome problem.