graders at eight different schools across the country. they gave our team of experts access to their social media feeds in realtime. with the permissions of their parents and schools, teens registered their instagram, twitter and facebook accounts through a secure private server that stored everything they posted over six months. from mean comments -- >> i suggest you stop being a bitch about it. >> to threatening ones. >> you are [ bleep ]. >> supportive messages. >> you are one of my best friends, and i trust you with anything. >> and explicit things. >> you dirty bitch. >> they all went into the vault, more than 150,000 posts in all. 150,000 pieces of a very complicated puzzle. seen, stored and analyzed by our team of academics. this ground-breaking cnn investigation is the first major study to look at what kids