Earlier quoted context omitted.
> What exactly are they afraid of? Exposing the level of detail in the data accumulated. This starts at "opened the messenger app at this location on this date&time" and goes to "visited this Facebook-unrelated website on these times". Having to provide all of this data exposes the detailed profile they're getting on people.
They are only getting what you are giving to them. If you decide to browse the web without uBlock Origin or if you decide to use Android, you know what you're being exposed to.
2. No, it doesn't matter if you use Android (what does using Android have to do with Facebook?) or not, Facebook can and will collect info on you through other means: analytics, logins, sharing etc.
3. You have very little to no idea of how pervasive tracking is especially in the case of large social platforms that everyone integrates with.