Table - US Facebook Penetration By Age

A brand is in a tricky position when it has no place to go but down. Given its must-have status among US teens in recent years—eMarketer estimates 95.9% of social networkers ages 12 to 17 used Facebook in 2013—that’s the position Facebook finds itself in, according to a new eMarketer report, “US Teens: Sizing Up the Selfie-Expressive Generation.”

And there are indications it’s vulnerable to a downturn—including an acknowledgement in Facebook’s Q3 2013 earnings call that it suffered a quarter-to-quarter dip in daily usage by younger US teens. Read the rest at eMarketer.