For Android:
- Use ADB (or similar tools) to remove Facebook, Meta, Twatter, Instagram, etc., from all your Android devices.
- Use a tool like RethinkDNS or other firewall to block block block. If using RethinkDNS, apply good blockers too.
- If using a firewall that uses your VPN slot, setup wireguard to use your VPN host
- Have different browsers on your device e.g. Brave, IronFox, Cromite. Follow online guides to set up.
- Use DuckDuckGo, SearXNG or Mullvadleta to search
- Never access Facebook, Insta, Twitter etc. from your mobile device. In fact, if you have the right firewall / blocking set up, you simply cannot.
- Do as much online shopping from a laptop / PC with a secure browser. Also, have about 3 different browsers there too.
- If you MUST use Facebook etc., only do it from a browser on your laptop / PC.
Just my personal strategy. My firewall logs show its quite effective but not fully impervious.