The teenage years can be a fertile period of experimentation and self-discovery, with teens banding together face-to-face or via social media as goths, geeks, emos, haul girls, Beliebers, Twiheads, Potterheads, LARPers or other subcultures. Youth behaviour has often prompted adult outrage – from concern about ‘juvenile delinquents’ in 1840 and rock ’n’ rollers in the 1950s to the outcry over boy racers in the 21st century.