This dilemma has plagued me for a whole summer! I've devoured books about Apple, Google, HP & Co. to learn stories of how founders met. Honestly, I learnt more from doing that (reading about previous founders for inspiration), than this article, but to be fair this article breaks down the four categories very simply. The great founders, and their meetup stories, all fall into one of the four categories. So it is wise to read both the article, and the stories of how our forefathers did it.