This became painfully clear to me particularly during the 2016 primaries. I watched as news organizations I formerly respected--CNN, NYT, NPR, WaPo--shamelessly twisted facts and spun deliberatly misleading narratives, even on their front pages. CNN now acts indignant when Trump calls them fake news, but because of what they did, they've made him not
entirely wrong, and I'm annoyed that they gave him that ammunition.
I think the best way to combat fake news is to have trusted, respected news organizations. But now both the right and the left no longer fully trust these organizations, so people have started looking elsewhere. IMO, the only way to fix it is for these organizations to start reporting honestly to try to regain our trust---so I think fake news is going to continue to be a problem.
Disclaimer: I know that CNN/NYT/NPR/WaPo propaganda is nothing compared to Fox News/conservative media. But it was misleading enough to shatter the trust of many people, including me.