Generally speaking, there are only a few ways to make money on the Internet. There are e-commerce companies and marketplaces - think Amazon, eBay and Uber - that profit from transactions occurring on their platforms. Hardware companies, like Apple or Fitbit, profit from gadgets. For everyone else, though, it more or less comes down to advertising. Social-media companies, like Facebook or Twitter, may make cool products that connect their users, but they earn revenue by selling ads against the content those users create. Innovative media companies, like Vox or Hulu, make money in much the same way, except that they’re selling ads against content created by professionals. Google, which has basically devoured the search business, still makes a vast majority of its fortune by selling ads against our queries.
NICHOLAS CARLSON, “What Happened When Marissa Mayer Tried to Be Steve Jobs.”