Interesting non-fiction often falls into one of three categories:
a. It's interesting because it's by or about a celebrity. People Magazine and various autobiographies appeal because they offer an intimate glimpse into someone you were already interested in. This is a lot of the appeal of social networks–famous to the family, telling their story.
b. It's interesting because an unlikely thing actually happened to a real person. Books about climbing Everest, starting a company or surviving drug dependency or a dysfunctional upbringing work because they happened to someone else, and we want to watch or vicariously experience what happened.
c. It's interesting because it's about us, the reader. These are books or blogs that offer a path forward, that talk about part of the human condition that you're currently experiencing, that offer solace or guidance or insight about what's happening and what's next.
We're all writers now. What makes you interesting?