Inside London's Teen Link-Up Phenomenon

A post blows up on social media and suddenly hundreds of teens are heading to the same spot in London. They're called "link-ups" but what's really behind them? And why are so many showing up? We hear from teens, police officers, youth workers, businesses and experts to find out what's driving these gatherings and whether we'll see more of them this summer. 00:36 What happened in Clapham? 01:31 What is a 'link-up'? 02:09 Why is this happening now? 04:41 What impact does social media have? 05:43 Do we need more police? 07:03 Could it happen again? #London #LinkUps #Teens #Teenagers #SocialMedia #YouthCulture #Clapham #Explained #Documentary Subscribe here: https://bbc.in/LondonSubscribe The latest from BBC London: http://bbc.co.uk/london