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Earlier this week, Flickr's fleet of image cache servers went temporarily insane, returning random images from the cache rather than individual users' proper pics. For some, this was just a mystifying annoyance, but a significant number of Flickr users had porn served into their personal photostreams. Many thus afflicted were only confused (blame Digg!), while others got a little freaked. Says one: "I was concerned because I don't want any of my visitors coming through and finding pictures of somebody's crotch, quite frankly." It's the "quite frankly" that shows she's serious, right? Anyway, I'd be curious if there's any data out there regarding just how much of Flickr is porn these days. The UK versions gets significant porn-hunting traffic from search engines. Anyone know how things stand in the U.S.?