Google have been testing ZERO search results in their search results.
Yep you read that correctly. For some search terms they were not showing any search results but answering the query themselves. This is mainly for calculations – or similar – so asking what 2+2 is Google will just show the answer (it’s 4 by the way) with a button for you to press if you want to see the search results.
Google – as does all website owners – what you to stay on their site for as long as possible so why wouldn’t they not show links to other sites.
By the end of March this test had been removed, it doesn’t mean it will not be back though!