According to a study conducted by the Pew Research Center’s Internet & American Life Project, more and more teenagers in the U.S. are losing their interest in using Facebook. The reason for the "waning enthusiasm," the study shows, is due to the "increasing adult presence, people sharing excessively, and stressful 'drama.'"
The study conducted on 802 teenagers, with ages ranging from 12 to 17, also revealed that teens are resorting to other popular social networking sites like Twitter, Instagram, and Tumblr because they felt like they could better express themselves on these sites. However, teens are still using Facebook because "participation is an important part of overall teenage socializing."
Facebook has responded to the reports saying, "We are always focused on making Facebook a great experience; and we're gratified that more than 1 billion people, including enormous numbers of young people, are using Facebook to connect and share."
Source: Pew Internet