How is this guy still taken seriously?
He's likely devoted thousands more hours than us pondering economic matters. I'm just looking through his wiki here... published hundreds of scholarly articles and 20 books. A professor of Economics at some of the best universities in the world. He's even received a Nobel Prize.
How can we fault someone for taking Paul Krugman seriously on economic matters?
Amazon is a storefront. Google is an ad service. Facebook is a glorified telegraph service. It doesn't matter how nifty their tech is. The only thing that matters in this context is what they do, and how that affects the overall economy.