What privacy settings across Instagram, TikTok, Snapchat should teens review?

[Victoria97]

I'm a high school teacher, and I'm increasingly concerned about how much personal information my students are sharing publicly on their social media profiles, from their locations and daily routines to family details. I want to organize a practical workshop for them on social media privacy that goes beyond just saying "be careful," but I need real-world examples and actionable steps that teenagers will actually listen to and implement. For other educators or parents, what specific privacy settings across major platforms like Instagram, TikTok, and Snapchat are most critical to review, and what engaging activities or discussion points have you found effective for illustrating the long-term consequences of a public digital footprint without coming across as fear-mongering or out of touch?