> the timing just lines up really well. The smartphone was invented in 2007, but it didn’t really become commonplace until the 2010s, exactly when teen happines

> the timing just lines up really well. The smartphone was invented in 2007, but it didn’t really become commonplace until the 2010s, exactly when teen happiness fell off a cliff Oh man so trivially incorrect. Plenty of people had smartphones before that despite the iPhone. What happened in 2010 was social media getting hit by politics and marketing. This isn't even up for debate. It's straight facts.