Some people keep using FaceBook because it doesn't easily let you delete your account and your peers have an expectation that your account should be current. In the long term this may work against FaceBook. The popularity of a social network site evaporates when the proportion of inactive web pages hits a threshold. A similar phenomen occurs in online games. The online worlds expand with the number of users but then interaction becomes very sparse when the number of users declines. This creates a downward spiral of decline. Anyhow, if FaceBook can reduce the prominance of dormant accounts and rely on peer pressure then an active user base can be maintained. However, social network sites don't have natural monopolies because sooner or later, you'll encounter a stage five clinger.
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Some people keep using FaceBook because it doesn't easily let you delete your account and your peers have an expectation that your account should be current. In the long term this may work against FaceBook. The popularity of a social network site evaporates when the proportion of inactive web pages hits a threshold. A similar phenomen occurs in online games. The online worlds expand with the number of users but then interaction becomes very sparse when the number of users declines. This creates a downward spiral of decline. Anyhow, if FaceBook can reduce the prominance of dormant accounts and rely on peer pressure then an active user base can be maintained. However, social network sites don't have natural monopolies because sooner or later, you'll encounter a stage five clinger.