Rebecca’s mother, Tricia Norman, said she had no idea that her daughter, who died this week, was being cyber-bullied by about 15 middle-school children, a problem that first arose and was addressed last year.

Inside her phone’s virtual world, she had changed her user name on Kik Messenger, a cellphone application, to “That Dead Girl” and delivered a message to two friends, saying goodbye forever. Then she climbed a platform at an abandoned cement plant near her home in the Central Florida city of Lakeland and leaped to the ground, the Polk County sheriff said. Read more…