"The sites assemble these bits of data into brilliant databases and reuse the information to provide value-added service—but only within their sites. Once you enter your data into one of these services, you cannot easily use them on another site. Each site is a silo, walled off from the others. Yes, your site’s pages are on the Web, but your data are not. You can access a Web page about a list of people you have created in one site, but you cannot send that list, or items from it, to another site."

...

He also bemoans the proliferation of net-connected apps on the Apple iPhone and other smartphones. "The tendency for magazines, for example, to produce smartphone 'apps' rather than Web apps is disturbing, because that material is off the Web. You can’t bookmark it or e-mail a link to a page within it. You can’t tweet it. It is better to build a Web app that will also run on smartphone browsers, and the techniques for doing so are getting better all the time."