Steve Knopper, writing at Rolling Stone:
Taylor Swift fans mesmerized by rehearsal clips on a kiosk at her May 18th Rose Bowl show were unaware of one crucial detail: A facial-recognition camera inside the display was taking their photos. The images were being transferred to a Nashville “command post,” where they were cross-referenced with a database of hundreds of the pop star’s known stalkers, according to Mike Downing, chief security officer of Oak View Group, an advisory board for concert venues including Madison Square Garden and the Forum in L.A. “Everybody who went by would stop and stare at it, and the software would start working,” says Downing, who attended the concert to witness a demo of the system as a guest of the company that manufactures the kiosks.