Back in 2015, I wrote a blog post called Dropbox: the First Dead Decacorn. At the time, it was the most widely shared take I’d ever written. I learned several things from writing this piece, and none of them had to do with Dropbox: I learned, for instance, that a great way to get people to click on your blog post is to make them mad. I also learned about a company called Social Capital, after my soon-to-be-colleague Ray reached out to me about...