As the Internet has grown from an experimental system to a commercial reality, the number of users and services has expanded exponentially. When the Internet started, an “Internet service” meant roughly one of three things: electronic mail, file transfer, or remote login. Today, “Internet service” is nearly synonymous with the World Wide Web, but the Web is not limited to simple hypertext documents — it includes rich media such as audio and video as well as personalized content in the form of Web portals.
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Douglis et al. (2001) studied this question.