The world's largest search engine has made changes to its image search algorithm, changes that make it a bit more difficult to find explicit content in the course of a simple search. Google rolled out the changes for its main US site today, and the changes apparently have yet to filter down to its international sites. The changes, apparently, were first discovered by social news site Reddit, and they make it so that users will have to be a bit more explicit in their searches in order to turn up pornographic and not-safe-for-work content.