When stars’ comings and goings began to be documented on a minute-by-minute basis, those changes triggered celebrity reticence. On its own, that wouldn’t signal the death knell of celebrity journalism as it’s been practiced for decades. But the pressure being applied to celebrity journalism from the top might pale in comparison to the threat surging from below, where a new generation of celebrities — YouTube stars, SoundCloud rappers, and various other earnest young people — share extensively on social media on their own terms, moving quickly and decisively (and messily) with no need for the patience and pushback they might encounter in an interview setting.