我们用以了解人群的很多信息来源都存在偏见，比如媒体呈现不同人群的方式存在偏差。
A lot of the information we get about human groups is through biased sources like how they're represented in the media.
同样的情况也适用于广告、电子邮件、YouTube和我们的其他服务：理解人与社交图，就能让他们所有人都更上层楼。
The same goes for ads, email, YouTube, and our other services: Understanding people and the social graph can make all of them better.
要充分理解用户开发者首先要理解人，因为我们都具有共同的特征。
To understand users fully, developers must first understand people because we all share common characteristics. People learn more easily by recognition than by recall.
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