So, for me, working with larger companies has often been very satisfying, precisely because of the ability of bringing critical mass to bear on a given effort.

Henry Kissinger once told me he was very concerned about the Internet's impact on people's ability to absorb information in a concentrated way, because we've become accustomed to looking up something, getting a snippet and being satisfied with that - as opposed to reading through and considering a weighty tome that goes into great depth.

Although I've had several major career changes, I was extremely hesitant about making some of them.

There is a project that's underway called the interplanetary Internet. It's in operation between Earth and Mars. It's operating on the International Space Station. It's part of the spacecraft that's in orbit around the Sun that's rendezvoused with two planets.

I shut down social media because I needed to shut out online distractions and engage with the people, issues, and work right in front of me.

Facebook is like the Internet: a large company and an application. Bitcoin is a protocol for decentralisation, so you could build a decentralised company on top of it, a stock market. It's an Internet of ownership, so it's not quite a direct comparison.

Compliance with the Stop Online Piracy Act would require huge overhead spending by Internet companies for staff and technologies dedicated to monitoring users and censoring any infringing material from being posted or transmitted.

As we were growing retail, and it was a huge growth phase, it was very important to keep our quality under control. Therefore, it was not just distribution, not just back-office operations, but also the risk-management practices. And these we learned together, supported by technology.