There were some search engines that displayed their results in an iframe rather than by going to the link directly. This was a very bad move and angered users tremendously. It's interesting to see how Google is trying to revive this concept through the backdoor of providing the user with a faster loading page. What with mobile being set to be a larger portion of visitors to websites at some point in the future this makes Google effectively the only real website on their view of the web and the rest of us chickens as information providers to Google, to be terminated at will.