Fake news is not news you disagree with. In fact, it is not news at all. It is content generated to drive eyeballs to ads (e.g., clickbait) or to spread false information (extreme bias, rumors, conspiracy theories, junk science, and propaganda, for example).
Websites created to mimic mainstream news sites:
Advertisements designed to look like news stories:
Look for labels: a corporate logo. Or a tiny statement indicating Paid Post, Advertisement, or Sponsored by. Or the tiny Ad Choices triangle at the upper right corner of an image.
Satire (for example, The Onion).
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