Let’s imagine, for a minute, a world in which App.net is successful. App.net is filled with people who understand the value of buying a product to preserve their privacy. “Members” pay $50 a year to enjoy a platform where they, not advertisers, are in control of their data. These are the people who are startup-literate, technically competent and probably well educated. Meanwhile, everyone else is on, let’s say, Facebook. Initially, I’m reminded of the split …