When Canadian teenager Caitlin Prater-Haacke was the victim of bullying, she didn't get mad. She didn't even want to get even. Instead, she got positive. Last month, a fellow student in George McDougall High School broke into Caitlin's locker. They used her iPad to post messages to her Facebook page, saying that she should kill herself. Sickened by this, Caitlin knew she had to do something. She bought hundreds of Post-it notes and put them all over her school in Airdrie, Alberta. She wasn't vandalizing the school, though. On each note, she wrote uplifting messages. She just wanted to spread...