19 links

But much social-network research involves simply trawling large databases for telltale behaviors or activities that might be typical of a terrorist. In this case the links among people are not based on actual relationships at all, but on an “affiliation network,” in which individuals are connected by virtue of taking part in a similar activity.

The New York Times Magazine writes about network theory applied to catching the bad guys at Can Network Theory Thwart Terrorists?

On a different point to consider, it was noted that “any two unrelated Web pages are separated by only 19 links.”

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