A study of how older teenagers use social media has found that Facebook is 'not just on the slide, it is basically dead and buried' and is being replaced by simpler social networks such as Twitter and Snapchat. Young people now see the site as 'uncool' and keep their【C1】______live purely to stay in touch with older【C2】______among whom it remains popular. Daniel Miller, who worked on the research, wrote: 'Mostly they feel embarrassed even to be【C3】______with it.' This year marked the start of what looks likely to be a【C4】______decline of what had been the most popular social networking sites. Young people are turning away in crowds and【C5】______other social networks instead,【C6】______the worst people of all, their parents, continue to use the service. 'Where【C7】______parents worried about their children joining Facebook, the children now say it is their family that insists they stay there to【C8】______about their lives. Parents have worked【C9】______how to use the site and see it【C10】______a way for the family to remain connected【C11】______, the young are moving on to cooler things. What appears to be the most important factor in a young persons【C12】______to leave Facebook was【C13】______that your mum sends you a friend request.' A study observed 16- to 18-year-olds in eight countries for 15 months and found that Facebook use was in decline. Instead, young people are turning to simpler services like Twitter, Instagram, Snapchat and WhatsApp which Professor Miller【C14】______were 'no match' for Facebook【C15】______functionality. 'Most of the school children in our survey【C16】______that in many ways, Facebook is technically better than Twitter or Instagram. It is more【C17】______, better for photo albums, organising parties and more【C18】______for observing peoples relationships,' said Professor Miller, adding that 'efficient isnt always best' in【C19】______young users. WhatsApp has overtaken Facebook as the number one way to send messages, say the researchers, while Snapchat has gained in popularity in recent months by allowing users to send images which 'self-destruct' after a short period on the recipients phone in order to maintain【C20】______. 【C1】