Since there is only the sorting method of "most popular", there will, of course, be certain images (and the ones host) which will be viewed - viewed too much. Really, nothing I've Moogled was helped by the "popularity" sorting. The most popular searches - I couldn't imagine otherwise - being porn searches (just enter a random obscenity! Fastest porn in the world!) is just really stupid for this sorting method. I wonder when 90% of all images you click on there displays 404 or "redirection limit exceeded", if Google will take a hint then.