Digital books and other texts are increasingly coming under the control of distributors and other gatekeepers rather than readers and libraries.

What keeps me up late at night, in the sense of worry, I guess it's innovation. It's funny to be worried about it, because it's a fair point that wow, look at the innovation we've seen over the past, not just 30 years, but over the past two years.

If what you are getting online is for free, you are not the customer, you are the product.

The qualities that make Twitter seem inane and half-baked are what makes it so powerful.

When something online is free, you're not the customer, you're the product.

When I worry about privacy I worry about peer-to-peer invasion of privacy. About the fact that anytime anything of any note happens, there are three arms holding cell phones with cameras in them or video records capturing the event ready to go on the nightly news, if necessary. And I think that does change a lot our sense of what is going on in our neighborhoods.

Enterprising law-enforcement officers with a warrant can flick a distant switch and turn a standard mobile phone into a roving mic or eavesdrop on occupants of cars equipped with travel assistance systems.