In addition to their 'do no evil' motto, Googlers have always been guided by another, much less explicit philosophy: 'computational arrogance.'

Diplomacy is, perhaps, one element of the U.S. government that should not be subject to the demands of 'open government'; whenever it works, it is usually because it is done behind closed doors. But this may be increasingly hard to achieve in the age of Twittering bureaucrats.

Contrary to the utopian rhetoric of social media enthusiasts, the Internet often makes the jump from deliberation to participation even more difficult, thwarting collective action under the heavy pressure of never-ending internal debate.

There is this group of people who love innovation. Those people want to innovate, and they think the Internet is a wonderful tool for innovation, which is true. But you also have to remember that much of that innovation is constrained within the realities of the foreign policy.

Technology is rooted in the past. It dominates the present and tends into the future. It is a real historical movement - one of the great movements which shape and represent their epoch.

Today, the smartphone in your pocket has a high-quality digital camera. Everyone - not just artists - is a photographer, and the explosion of photos taken annually proves it.

Of course Airbnb made mistakes the first year! Some came from our own preconceptions. When we started, we designed our interface for ourselves, Internet-savvy twentysomethings. We never considered the role of good eyesight in our interface - font size, vernacular; it all matters.

Snowden was extremely good at digital self-defense. When he was employed by the C.I.A. and N.S.A., one of his jobs was to teach U.S. national security officials and C.I.A. employees how to protect their data in high-threat digital environments.