When Billy Ball lost his 6-year-old son in January after an accident brought on by a rare medical condition, Ball posted his son's obituary on Twitter and started a fundraiser in the child's name to raise money for an art program at his son's neighborhood school. In one case, Facebook determined that a comment in which a user mocked and accused Ball of killing his son did not violate community guidelines and declined to remove the comment. But after learning that other parents who have lost their children were being attacked online, the father wanted to find a way to let them know that they were not alone