It’s the first thing Tiffany Benson, 29, a stay-at-home mum in Modesto, CA, mentions when rattling off a considerable list of parental fears, and her daughter is only in third grade (she also has a son, who's 4). The 9-year-old’s teacher just sent home a note asking that children keep their phones off in class. “That blows my mind,” Benson says. All she can do is not let them have phones, but still. “The thought that bullying can be taken so much further and be a 24-7 activity: I’m terrified for it to happen to my kids; I’m terrified for them to be the bully,” she says.