觉得下面这段很有意思。 But as we're fond of pointing out, Google is essentially a maker of very capital-intensive, full-custom, warehouse-scale computers—a "hardware company," if you will. It monetizes those datacenters by keeping as many users as possible connected to them, and by serving ads to those users. To make this strategy work, it has to hire lots of software people, who can write the Internet-scale apps (search, mainly) that keep users connected and viewing ads. Since the price of Google ads is set largely independently of Google's cost of delivery, every dollar of efficiency that Google can wring out of one of these large computers is a dollar that goes to the bottom line.