>> reporter: in her 13 years, nicole lovell endured life-threatening illnesses, liver transplant surgery left her scarred, medicine caused her to gain weight says her stepmother terri lovell. >> she would send me messages about little girls picking at her on school, saying she was fat, and she would cry, you know, didn't want to go to school. >> reporter: so the seventh grader sought a better life online, against her father's wish, she created numerous social media personas. >> she'd sit at the table at 13 years old and set profiles up on facebook that we had no idea about. a minor should not be able to do that. >> reporter: but in this invisible world online these kids are in... >> we have no idea who they're talking. to. >> reporter: one person police believe she was talking to was her accused killer, 18-year-old david eisenhauer, possibly on the messaging app kik. kik allows its users to remain anonymous and send photos that leaving no trace. ju'riese colon is with the national...