First, advertising. Many people disdain to mention this and want to create a new model to replace this traditional way, but they have to admit that advertising is still the biggest way to make money on the Internet. Most of facebook's revenue depends on advertising, and Google is basically an advertising company. China's Baidu, Renren, Douban. . . . Almost entirely by advertising.

Second, e-commerce. Amazon, ebay and Taobao are the representatives.

Third, third-party payment tools, such as paypal, although different from e-commerce, are closely integrated with the development of e-commerce. Third-party payment has many other ways of making profits, providing services similar to traditional financial services, but relying on networking can make more possibilities.

Fourth, value-added services. Tencent is the biggest representative of virtual goods, or all similar value-added services provided by the network.