Ответ:

1. Merthe Weusthuis made the mistake of
▪︎not checking who could see her online invitation
"But Merthe made one big mistake: she used open-access settings on Facebook, so it wasn’t just  her  friends  who  could see details of the event, lots of strangers could too."
2. The number of confirmed guests
▪︎got out of control almost immediately
"The number of invitation acceptances quickly snowballed into an avalanche."
3. 'Project X Haren' was named after 
▪︎a film
"The party become known as ‘Project X Haren’ after the 2012 American film Project X in which three high school students throw a birthday party that spins out of control."
4. Local journalists
▪︎gave the event publicity
"Even after Merthe’s parents had cancelled the party, the publicity didn’t stop. Local media reported on the forthcoming event and teenagers turned up to have their pictures taken outside the Weusthuis family home."
5. Violence broke out when
▪︎people realised there was no party
"When it became clear that there was nothing to gatecrash, violence broke out and 500 riot police equipped with helmets, shields and batons were brought in to control the crowd."
6. After the riot, Facebook was used to
▪︎help the town recover from the violence
"However, Facebook was also involved in the clean-up effort in the days after the riot."
7. Bradley McAnulty
▪︎had taken steps to prevent problems
"Bradley had not posted details of the event on the internet, and had been careful to ask his friends not to, but somehow the news leaked out and appeared on Blackberry Messenger as well as Facebook."
8. In Bradley McAnulty's case, 
▪︎the gatecrashers caused a lot of damage to his home
"More than 400 gatecrashers invaded his family home in Poole, Dorset, causing extensive damage."
Объяснение:
Согласно тексту. Текст во вложении. Ключевые фразы выделены. В кавычках даны цитаты из текста.
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