Serious and business don't necessarily go together, though I suppose that for grown ups they often do. I can't peer into the hearts and minds of the most prominent movers and shakers in the internet world, but it's my guess that their original approach to their businesses were considerably less serious than they are today. Before it was a business Google was a way to find information on the rapidly expanding web. Similarly, Facebook sought to connect people. At one point these were desirable, even necessary, services, and I trust that those who built them were in it at least as much for the fun as for the profit. There's definitely such as thing as "serious fun", and I'd like to think that sometime in the not too distant past that was at least part of what motivated today's moguls. But it ain't like that today.