The substitute Jesse Lingard, center, scored on a header in the second half to give Manchester United a 2-1 victory over Chelsea. The result moved United back into second place in the Premier League. Credit Andrew Yates/Reuters By Rory Smith Feb. 25, 2018 MANCHESTER, England — Emblazoned on the great glass frontage of Old Trafford’s East Stand, sandwiched between the soft bronze statue of Sir Matt Busby and the neon red letters of the club’s name, was proof of Manchester United’s complete conversion to the digital age. This week, United launched its own YouTube channel. To celebrate, the club placed a vast YouTube logo on its stadium . Underneath it, towering over Busby’s head, was the page’s address. Every other Premier League club has long been on the platform. Now, at last and in style, United has succumbed to the future. For a team that has long been so pioneering and so groundbreaking off the field, United has always seemed curiously hesitant when it comes to soci