Companies in Silicon Valley invest a lot in understanding their users and what drives user engagement.

When I started eBay, it was a hobby, an experiment to see if people could use the Internet to be empowered through access to an efficient market. I actually wasn't thinking about it in terms of a social impact.

I had the notion that, OK, so now we have all of this wealth, we could buy not only one expensive car, we could buy all of them. As soon as you realize that you could buy all of them, then none of them are particularly interesting or satisfying.

I had always been interested in markets - specifically, the theory that in financial markets, goods will trade at a fair value only when everyone has access to the same information.

The president and the administration had a duty to defend the Defense of Marriage Act, but powerful constituencies of the president did not want the president to defend it. And unfortunately, politics trumped duty.

Democracy as a system has evolved into something that Thomas Jefferson didn't anticipate.

One of the reasons the American public holds unelected government officials in such low esteem is that they are never held accountable for their failures.

Single women will get us closer to gender equality, and that will take many forms, including a reimagining of what families entail and what it means to have a full female life. Also, their presence will force the government to support a population of independent women more capably.