Mixed-Revenue and Fee-for-Service Social Networking Sites Although most social networking sites use advertising to support their operations, some do charge a fee for some services. For example, the Yahoo! Web portal offers most of its services free(supported by advertising), but it does sell some of its social networking features, such as its All-Star Games package. Yahoo! also sells other features, such as more space to store messages and attached files, as part of its premium e-mail service. These fees help support the operation of the social networking elements of the site.