As an example. Some random guy tweets that CNN showed Porn instead of an Anthony Bourdain show. Based on nothing else Daily Mail, Esquire, GQ, Fox News had articles up immediately giving the claim legitimacy and a massive audience in the tens of millions. Of course it never happened. This isn't on some spectrum of different opinions. This is a flat out lie, that was never fact checked by seemingly reputable companies that suddenly became true.
The fact is that because of Twitter and Facebook and the financial importance of being first to the punch the integrity of news is slowly but surely going down the toilet. So yes the fake news epidemic is real, serious and very much a new phenomenon (because media companies rely more and more on internet revenue).