For kids, the joys of friendship are often expressed in the photos they share on social apps such as Snapchat, Instagram, and WhatsApp. These types of photos — the group shot from a day at the beach, a selfie at the DMV or the prom — document kids’ lives and strengthen relationships. But as we all know, cell phone cameras can be misused, and a new crop of photo apps are being used to hide photos instead of share them. Sometimes called “ghost apps,” these secret-camera and hidden-photo-vault apps let you snap pictures or video without anyone knowing and stash them in secret folders. Use of these apps for sexting is increasing in schools, including a Denver-area school in a situation that involved hundreds of students. Read more at Common Sense Media