250 million people engage with Facebook on external websites every month.

每月，大约有2.5亿的人从外部网站访问facebook。

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An example of internal information might be log files from a data center, and external information might be several crawled websites or a dataset downloaded from a data catalog.

一个内部信息的例子可能是数据中心的日志文件，外部信息可能是一些抓取的网站或从数据目录下载的数据集。

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Of course, you’ll also need to work on gaining valuable links from relevant websites as external linking is a major part of the success of an organic search campaign.

当然，你还需要继续努力去获得相关网站的宝贵链接，因为外部链接是原生搜索推广活动成功的主要因素。

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The subscriber, however, now has a better journey with just two clicks to buy and does not have to navigate external websites.

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It angered some members in the past when it introduced a new advertising system, called Beacon, which delivered adverts to users on external websites based on their Facebook profile and habits.

BBC: Facebook offers control to users