I was a summer student at Stanford and porn sites routinely came up in the address bar as frequently visited sites. It was obvious there was a lot of traffic on such sites on their very own library computers. Our group of BYU students would laugh when we would type in a "b" for bing or something and any number of booby words sites would show up as possible matches for the address we were starting to type. It was pretty funny. I was surprised they didn't have better filters on their systems.