With a legion of over four-million subscribers, Marcus Butler was one of the U.K.'s most famous YouTube acts, his channel comfortably in the Top 30, just behind the likes of Coldplay and motoring show Top Gear. He frequently collaborated with other YouTube stars, such as fashion and beauty vlogger Zoella and prankster Caspar Lee, and took part in a YouTube boy band that released a charity video for Comic Relief. Having amassed such a large following, he took the next logical step of releasing his autobiography. Hello Life!, published in 2015, was not only an autobiography but ...