David Lieberman at Deadline points out one of the most noteworthy parts of Facebook's earnings call:

...CFO David Ebersam said the company had seen a drop in use among young teens. “Our best analysis on youth engagement in the U.S. reveals that usage of Facebook among U.S. teens overall was stable from Q2 to Q3, but we did see a decrease in daily users, specially among younger teens.”

Every stock analyst in the country is looking for concrete proof that teenagers are dropping Facebook in droves. That's generally been the quietly agreed-upon point at which Facebook loses its amorphous sense of "cool," and that's when the barrage of "Is Facebook Dying?" articles will start being published around the world. Lieberman says the above information has already done some small damage to Facebook's stock price, but I don't think this is enough to hurt Facebook in the long term. It is, however, a tiny taste of things to come.

In other news, it looks like almost half the site's daily users are accessing Facebook on mobile devices. I'd like to take this opportunity to remind you that deleting the Facebook app from your phone is a really simple, satisfying way to feel better about your life. Seriously, you don't need Facebook on your phone. I know quite a few people who've deleted the Facebook app from their phone (or even just removed it from their home screens) and they all say it's made their days better in tiny, significant ways.