Did Messenger Just Make Facebook Cool for Teens Again? Not Quite.

Being "cool" is a fleeting sensation for Silicon Valley companies, where innovation moves at breakneck speeds, competition is relentless and users often fickle.
But when you're an 11-year-old publicly traded company like Facebook, it means dealing with the challenge of keeping young people hooked long after the newness rubs off. Mark Zuckerberg suggested as much in 2013 when he told investors that “coolness is done for us.”
And it's no secret that two years later, the company has a problem keeping teens around. Up to 1 million teens a year quit Facebook, shirking it for other platforms like Twitter and Snapchat, by some estimates. At this year's F8 Developer Conference in San Francisco, Facebook announced it would open up Messenger to outside app developers.