No, fake news started long ago. You are very confused if you think these mainstream media companies are lieing to avoid talking about why hillary lost. They give lots of reasons that appear to be valid, like that she didn't pay enough attention to those important three states, and that she had no widely publicized plan to deal with the people that lots their local factories and jobs. I think this latter case was really important, and HRC really missed out on this area. A lot of trump supporters seem to believe that billionaire and job exporter trump will somehow get their factory jobs back to their town. This idea has been widely discussed.
Sure, some people also wrote about how trump won because of fake news (i.e. blog posts about things that aren't true, like the comet pizza thing), and that must have contributed, but that is just one of many things.