Given fake news/images/books, deepfake videos... How do you know you aren't living in a fake world?

I recently saw a post about a fake book full of fake images of fake people.  Given that we live in a world with fake news, digitally altered images, deepfake videos and fake books...  How do you know you aren't living in a fake world?  
  • I interact with real people.
  • I get real information from the IEEE and IEEE colleagues.
  • My name is not Trinity or Neo.
  • I admit that I really don't know. 

How can technology counter a fake world? 

What are the ethics behind posting or spreading fake news, images, videos and more?