William. The stories you've heard the 25% of the internet (or more) is porn are urban myth. Get a list of the top 100 sites. NONE of them are porn sites although some like MySpace may have pornographic content. If you know something about web traffic, a few very popular sites and a very very very long tail all the porn sites that exist are part of that long tail. So porn is clearly a tiny part of the internet. But if you want to find porn, that's easy. "Net Ratings, tracked the number of visitors to porn Web sites. It says that in April 2001, there were 22.9 million unique visitors to porn sites. This says nothing about how long each visitor stayed or whether they spent a dime. In any event, the number of visitors is less than the number who visited news sites (41.1 million), finance sites (34.2 million) or greeting card sites (25.5 million). When was the last time you heard anyone talk about how greeting card sites dominate the Net?" In fact it's impossible to tell exactly where the porn sites are, except by looking. Any photograph may or may not be porn, any text may or may not describe sex in a pornographic manner, any video may or may not be pornographic. So you can't tell by file types what the file contains. Forester Research tried to make the measurement you asked for. They gave up. They said that the margin of error was so great that the numbers they were producing were essentially meaningless. John William Bain wrote:
Bob Rehak wrote: "Taking the question in a slightly different direction, I'm curious as to what percentage of internet "content" is pornographic --