https://www.cnbc.com/2017/08/22/facebook-may-have-a-grown-up-problem-young-people-leaving-for-instagram-and-snapchat.html >SAN FRANCISCO — Facebook will see a decline among teenagers in the U.S. this year, says market research firm eMarketer. >EMarketer predicts 14.5 million people ages 12 to 17 will use Facebook in 2017, a decline of 3.4% from the previous year, as they migrate to Snap's Snapchat and Facebook's Instagram.