While a student at Belmont High in Belmont, New Hampshire, Ryan Vallee — under the name of Seth Williamson — would initially befriend teen girls by texting them about their favorite ice cream or the name of their pets. They thought he was been sweet. He was after clues to their social network passwords. His aim? To hack their accounts in a bid to extort them for nude selfies. If he didn’t get what he wanted, his demands escalated.