Catherine Seale’s son, Christopher, 17, invited 60 guests to a party at his parents London home on Saturday. The party was posted on Facebook with the toggle set to public after a friend mentioned it on the social networking site. Neighbors told the Huffington Post that six police back-up units were required to break up the crowd, which in the space of two hours mushroomed to a crowd of at least 600 gatecrashers. One girl was reportedly rushed away in an ambulance, suffering from alcohol poisoning, and a skylight broken.”]