Humans infer a great deal about their environment by looking at how other people move about it. For example, before entering a new restaurant, we often look at how crowded it is. Shopping offers another example - we tend to be drawn to busier retailers, as they are more likely to have the latest fashions or biggest sales.
Interestingly, despite the fact that the internet is teeming with millions of people, this most-basic of social phenomena is invisible to us. There's no notion of crowds on the web - where users are congregating, and where they are flowing to and from.
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