As to what #pizzagate is, it's largely buried in searches now but this is a good intro:
!!!!! NSFW !!!!!
http://vigilantcitizen.com/vigilantreport/pizzagate-4chan-un...
!!!!! NSFW !!!!!
Basically, some people found some really weird and creepy photos and weird emails in the Podesta dump and started digging. Things have kind of snowballed from there.
Feel free to go back to the Podesta dump on Wikileaks and look things up for yourself. Just start searching for mentions of "pizza." A lot of the things have been taken down now and only exist as archive links, though.
Here is a report from the NY Times (an actual respected organisation) who shows the damage this type of Fake News has:
http://www.nytimes.com/2016/11/21/technology/fact-check-this...
Yes, you can find unhinged conspiracy stuff written about this. I'm not aware of any proof of anyone committing crimes, nor am I going to claim anyone is guilty without evidence. But there's enough weird that people are going to be digging into this one for a while.