I found a cool site called "Food for the Brain" that offers this simple explanation.
我在一个名为“大脑的食物”的网站上，找到了对上述问题的简单的解释。
youdao
How do you know when a social networking site isn't cool anymore?
如何才能知道一个社交网站不再前卫了？
The site is cool!
站点是凉快的！
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