Peter Drucker lives on as one of the greatest business and management minds of the last 100 years. If he had blogged, he would have had millions of followers. As a content marketer, the most important insight I can share is to think like Drucker when you're ready to write.
Content marketing has been around for 100 years or more. Is it a trend or is it mainstream? Actually it's both. It was a trend and now it's a fundamental, mainstream marketing philosophy. In fact, content marketing is the new purple, which was the old black, which was, of course, positioning.