A、US adults turn to Facebook for socializing. B、US teens show no preference for Facebook. C、US adults are keen on using social m

A new study has found that the number of American teenagers using Facebook is dropping. Many turn instead to YouTube, Instagram and Snapchat. The study by the US-based Pew Research Centre found that 51% of American teens between the ages of 13 to 17 said they currently use Facebook. This was a large drop from 2015, when 71% of teens in that age group reported using the social media service. The study found that YouTube is now the most popular Internet service for teens, with 85% saying they currently use it. The second-most popular is Instagram, at 72%. Facebook owns Instagram. In March, another Pew study found that 68% of adults said they were Facebook users. Of those, 74% said they used the social media service daily. About half of the adults reported using Facebook several times a day. Results of the latest study were based on interviews with 743 teens and more than 1,000 parents during March and April 2018. The study also found that 95% of teens reported they either owned a smartphone or had a way of using one. This marked a 22% increase over a similar study from 2015. When asked which services they use most often, 35%of teens identified Snapchat. About 32% said they use YouTube the most, while 15% said they use Instagram more than other services. The Pew study found that, in general, teens from different economic and racial backgrounds liked the same services. However, the researchers did find some differences.
Questions 9 to 11 are based on the passage you have just heard.
9. What is the speaker mainly talking about?
10. What did the Pew study in March find?
11. What is the conclusion of the Pew study?