Rumors about Pizzagate hit the internet. Twitter removes people talking about it. Reddit deletes the group talking about it (but leaves actual groups of pedophiles online!). Even 4chan, the internet's cess pit is trying to censor it. The MSM won't touch it. Suddenly there's a big war on "fake" news, simultaneously by the new media, the old media, and now the government.
This much censorship makes it MORE likely there's something to the allegations, not less. Nobody cares when the National Enquirer makes up nonsense about Brangelina or the Weekly World News claims to have found aliens.
Media should ignore fake news when possible. Reporting it, even to debunk it, tends to give the story more credibility and make the target look more suspicious.
Pizzagate is a great example. It's fake news, a particularly ridiculous piece of fake news where people have invented a massive pedophile network all because they didn't understand why a restaurant owner (who was also a fundraiser) was mentioned in an email.
Pizzagate isn't a scandal. It's a trashy detective model where the characters have been given names of real people.
Now were Twitter and Reddit right to censor those discussions? I don't know. Going by the fact I've been spared knowing about this particular piece of stupidity until now I can't say they're wrong.