Facebook built the internet?
Now, consider that it's common across South-East Asia to have very basic data plans that allow you to navigate Facebook for free (or at heavily discounted rates). https://www.mmtimes.com/business/technology/20685-facebook-f...
For a huge lot of these subscribers Facebook is the Internet.
People in the developed world who after gone through innumerable Internet phases and fads, and who presumably have more experience and a better sense of its subcultures, still have a hard time to distinguish fake from legit news.
How do you think a small towner in Myanmar who went from zero to Facebook overnight would fare?