It’s 1 a.m. in Tuscaloosa, Ala. and a coven of barely legal coeds are divining the fates of their peers in the basement of a sorority mansion. They pore over data sheets, interview notes and custom-made “grading” software that ranks wannabe sorority sisters in a carefully calibrated scoring system. They cross-reference the social media channels of 17-year-old girls, swiping through grids of tanned, smiling teens on Instagram and TikTok. And then with a nod from their leader, they wordlessly delete the “bottom girls” who won’t make the coveted sorority’s final cut — even though they’ve never even met them. Welcome…