etiquette - How to politely and logically explain that I don't want to receive notification at my private social media account?

My department is becoming more and more annoying by posting everything in Facebook group, from exam results, seminar schedule, to private information about students ( telephone numbers, addresses, emails, etc.)

I don't know how to explain them that I care about safety of personal information and that privacy of my personal information are important to me, but please be aware that I don't want to sound pretentious. Is there any way to address this issue correctly?