MELBOURNE, Australia - According to a study conducted in October by Web-analytic company Hitwise, while social-networking sites have become more popular with Internet users 18 to 24 years old over the past few years, adult sites’ popularity with those users has declined.

“I’ve actually been puzzled by the decrease in visits to the adult-entertainment category over the last two years,” said Bill Tancer, general manager of global research at Hitwise and a writer for Time. “Visits to porn sites have dropped from 16.9 percent of all site visits in the U.S. in October 2005 to 11.9 percent as of the week of Oct. 21, a 33 percent decline.”

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