If I look into my past, I was definitely into inventors. I was into stories of Edison and Tesla and da Vinci and all these guys making stuff in their garage.

Doing research for 'Penumbra,' I read quite a bit about the early history of printing, and the more I did, the more it sounded like... the Internet today. There was crazy competition and upheaval; there were constant arguments about new techniques, new materials, new machines; and, of course, there were fortunes to be made.

Social systems have values - arguments baked into their design. For example, Twitter's core argument seems to be, 'Everything should be public, and messages should find the largest audience possible.' Snapchat's might be, 'Communication should be private and ephemeral.'

When you close a tab or when you finish an article on the web, it's gone unless you go back into your history or search for it or explicitly try to find it. Apps on your phone have this special property: they hang around. In some ways, they're more like a book on a bookshelf than they are like web pages.