wire ☑ (not the messaging app) utilise witches.town. Vous pouvez læ suivre et interagir si vous possédez un compte quelque part dans le "fediverse".
Update:
1) Google collects your location with Android, even if you disabled it in the system settings;
2) Facebook (and Google) access to your contacts and use it to make networks;
3) you may give granular permissions to Facebook and Google by rooting your phone and installing a ROM such as Lineage OS or Replicant; and
4) in my country, France, the law allows me to ask them to delete anything I want.
If you want both privacy and security you may want to have a look at these links:
1) Blackphone: https://www.styxblackphone.com/buy-blackphone
2) BSD-based secure phone: https://hackaday.io/project/13145-bsd-based-secure-smartphone
Reminder that Replicant has disclosed a backdoor in the Samsung S4's baseband chip so they're not chilling here