‘Denver Resident Here. Reddit, I’m Doing My Best to Update This.’

But one of the most effective sources of information about the massacre has been Reddit. In particular, “Comprehensive timeline: Aurora Massacre,” a Reddit page that offers a tick-tock of the Aurora events that play out in granular, heartbreaking detail. Posted a few hours ago, it has already received hundreds of upvotes, and is on its way — already — to becoming one of the definitive documentations of the tragedy.