c. eBay

d. Craigslist

5. "You can't build an electricity grid and say, 'You should go out and invent vacuum cleaners. Or keyboards or toaster overs.' You have to give the right tools and primitives to folks, so they can build what they want, and what they want to see in the world. The interesting products out on the Internet today are not building new technologies. They’re combining technologies." Who's not interested in telling people to invent vacuum cleaners or toaster ovens?

a. Google's Larry Page

b. Twitter's Jack Dorsey