After years of basically printing money, the big online Internet behemoths are starting to stumble for various reasons. There's the macro slowdowns. New competition. And just basic threats to the way they do business. One major change has come from Apple, which has used its device dominance to curtail how apps can collect information on users, making targeting harder than it used to be. On this episode we speak to Bloomberg reporter Mark Bergen, the author of Like, Comment, Subscribe: Inside YouTube's Chaotic Rise to World Domination, about the difficult challenges facing the industry.