Wow, I remember reading the App Developer AMA and assuming it was fact without checking any references myself. Beyond filter bubbles and fake news, this really shows how susceptible we are to our own bias.
On the other end, I could just believe everyone at face value, and get bamboozled and misled frequently.
Instead, each person has to strike a balance. Have a balance of trust, and recognize when you're putting forth faith in someone. Be ready to transition from trust to cynicism. For things that don't matter (like "believing someone is a millionaire"), don't worry about it - unless and until that "millionaire" tries to offer you personally something too good to be true.