美国有1.1亿人使用社交网络(网络人口的60%)，平均来看，他们登录这些网站的次数很多。

Out of the 110 million Americans (or 60% of the online population) who use social networks, the average social networking user logs on to these sites quite a bit.

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该研究中心说，少数种族群体访问网站的次数更多是因为他们更年轻、更多的使用移动互联设备。

Minority groups visit the site more because they are younger and use mobile technology more often, the centre said.

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利文森表示，一个人访问社交媒体网站的次数比花在社交媒体上的总时长能更好的预测睡眠问题。

Levenson said the number of times a person visits social media is a better predictor of sleep problems than overall time spent on social media.

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And she was able to tell me that they can divine from the hits on their site why people are coming to that site.

她告诉我，他们可以从网站的点击次数,推断出人们为什么访问他们的网站。

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