Re: 22,484 !!
Hi, I'm the co-author of the paper quoted in the article. In regards to your question we downloaded the top one million Alexa sites, then extracted any sites that had "porn" in the title, url, or meta description. It turns out it is a totally unique sub-string which is very helpful for matching. The tracking analysis was done by an automated system, webXray.
Biting the hand that feeds IT
