I am an assistant principal in a middle school (grades 6-8). When I have to search a student's cell phone, I often get sick to my stomach at what I find. It gets worse and worse every year.
"Even basic open source research suggests that 'Momo' is run by hackers who are looking for personal info. The danger lies with your child feeling pressured to either follow the orders of ANY app via 'challenges' or peer pressure."