Facebook lost around 2.8 million U.S. users under 25 last year. 2018 won't be much better.

That's according to research firm eMarketer. Facebook is losing young users even quicker than expected, according to new estimates by eMarketer. The digital measurement firm predicted last year that Facebook would see a 3.4 percent drop in 12- to 17-year-old users in the U.S. in 2017, the first time it had predicted a drop in usage for any age group on Facebook. The reality: The number of U.S. Facebook users in the 12- to 17-year-old demographic declined by 9.9 percent in 2017, eMarketer found, ...