'Pizzagate' — The deranged conspiracy theory that jumped from hashtag to IRL violence

On Sunday afternoon, an armed man walked into pizzeria Comet Ping Pong in Washington, D.C., firing his weapon at least once and causing a whole lot of havoc.

The reason for his actions? He was there to "self-investigate" an online conspiracy theory now handily known to those online as "Pizzagate," one of the weirdest, most grotesque Hillary Clinton conspiracy theories ever circulated (which is saying something). 

But to the casual news consumer, this may be the first they've heard of Pizzagate. So, if this is you, here's the backstory. Read more...