核心Facebook类封装了对用户进行授权、创建Facebook对话框、发出API请求、注销用户以及获得或设置访问和会话信息及状态的方法。

The core Facebook class encapsulates methods to authorize the user, create Facebook dialogs, make API requests, log out the user, and get or set access and session information and status.

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用户没有注销，但我们允许每个用户会话在两分钟后关闭。

The users were not logged out, but we allowed each user session to expire after two minutes.

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注销，用户选择Sign out选项结束会话(图2)。

Sign out, in which the user selects the Sign out option to end the session (Figure 2).

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