Social Media Privacy Settings

I'm a bit nerdy but I read the detail of the privacy policy and settings of my social media apps. I try to understand how I can control the settings to my liking. I made a closed classroom Facebook group and administer/monitor what is posted to the group. I invited the members. I try to protect my classroom students like I would my own children. It's a good practice to check out the privacy settings for social media, in order to prevent inappropriate sharing.