Teaching Critical Thinking
People need to know that they are capable of determining whether a source is credible. They don't need others (or worse, machines) doing it for them. I tell my students (adults ages 18-80+) to practice emotional skepticism before sharing stories, memes, or tweets. This means that they should consider the source of the information, see if they can find it verified elsewhere, and read the story themselves before sharing. They also need to know how to look outside the story for more information. What can they find out about the writer or publisher that isn't part of the PR for the site? I also recommend that they get their news from a variety of sources to cut down on the "echo chamber" of social media.