I was going through some of the search term today just to see if google has imporved the search results. I was searching for popular phrase which has quite a lot of results in google. I clicked on the second page in google and found domains ending with .EDU are being used as a doorway page. I wonder how difficult it is for google to identify such a blunder.
Google Assuming .EDU extension domain to be high in a high priority , companies are able to exploit it.
Doorway Page