Mass shootings in the United States are a depressingly familiar occurrence. But why do conspiracy theories spring up and spread so rapidly online in the aftermath of such horrific events?
There is a mass shooting in the US an average of once a day, according to data compiled by the Gun Violence Archive.
After each big shooting, a familiar script follows. Thoughts and prayers are proffered. #PrayFor(InsertLatestTownHere) trends on Twitter. Rival politicians argue about when the best time to talk about gun control might be. And then most of the world seems to move on and forget about it, until the next one.