Jacqui Cheng:

Teenagers know a lot more about privacy than we think, so what are they trying to tell us when they post?
I know which of my teenage students smokes weed in the park after class on Fridays, and which other students are with him. I know which ones are struggling with making friends in their first few weeks at college, and which ones aren’t. I know which of my students chafe against overly strict parents on a regular basis. I know which one spends every weekend in the hospital due to a chronic condition. I know which ones got arrested last night.
I know all these things because I follow them all on various social media services. And they know I know; this isn’t some kind of stolen glance into the online life of teenagers that no one is supposed to see. Contrary to popular belief among adults, these teenagers are not oblivious to privacy settings and do care a good amount about who can see what online. If anything, most of them have consciously chosen what they want to show to me and the rest of the world through social media. And what they’re telling us is who they are and what they need from us as mentors.