The media was covering fake news well before the election.

I suspect that, had Hillary won, we'd have seen the same amount of coverage, but with a tone of "it was a close call".

It has been clear for a long time that large-scale trolling and fake news operations were underway for a long time, and needed to be addressed.

Indeed, I expect that the MSM is being somewhat restrained here, because they don't want to seem like sore losers.