扎克伯格与哈佛同窗于2004年创办这个网站，至今有5亿现时用户。

Zuckerberg created the site with his Harvard room-mates in 2004 and it now has 500 million active users.

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这个故事由用户定制，并对其进行跟踪，有新内容出现时通知用户。

The story is customized to the user, keeping track of what they have already seen so that it can alert them when new content is available.

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这是因为JFS2在实现时使用了写独占(write - exclusive)索引节点锁，允许多个用户同时读取相同的文件。

This is due to the way in which JFS2 is implemented with a write-exclusive inode lock, allowing multiples users to read the same file simultaneously.

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