This page provides some examples of fake news: https://www.buzzfeed.com/craigsilverman/partisan-fb-pages-an...

"We rated 82 out of a total 666 right-wing Facebook posts as mostly false, for a percentage of 12.3%. Another 169 posts (25.4%) were rated as a mixture of true and false. Viewed separately or together (38%), this is an alarmingly high percentage."