From internal leaks within the company as well as external analysis, the tip of the iceberg behind Facebook's spyware empire is exposed. Take a look to better protect yourself when you're not even on the platform: https://simplifiedprivacy.com/facebooks-corrupt-off-platform-surveillance/
I have a tablet in my kitchen I use while cooking. I have only couple of apps on it, it does not sync my contacts and I don't use it to browse the web daily. That's when my WhatsApp client is installed. I still get messages, just not instantly. With Facebook groups you don't have to be online 24/7, you can just check them from time to time.