The claim comes from Albert-Laszlo Barabasi of Northeastern University in a study published in Philosophical Transactions of the Royal Society. He specializes in network theory, both among humans and in tech.
19 clicks may seem a short maximum chain among an estimated 14 billion pages online, but Barbasi says two key factors make it work. The first is that its humans who decide what should go on a particular web page, and we tend to organize information in multiple logical ways. When we create a new page, we may categorize it as fitting into a particular topic, a geographical location, an organization, or any combination of these issues. This gives it a natural connection with several different types of other page, increasing the chance of a link between the two.
The other factor is the existence of aggregator sites such as Reddit which provide an indirect link between thousands of otherwise unconnected sites. They effectively act as directories rather than search engines, which aren’t counted: Barbasi was looking specifically at clickable links rather than having to type terms to continue the navigation.
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