Google
announced on the Search Liaison Twitter account just now that it has updated its search results to show a more diverse set of search results. That means Google will aim to show no more than two results from the same domain for a particular query in the top results.
More diverse Google results. Searchers, along with SEOs, have complained over the years that sometimes Google shows too many listings for the top search results from the same domain name. So if you do a search for a particular query, you may see 4 or 5 of the top ten results from the same domain name. Google is looking to not show more than two results from the same domain with this search update.
Google said “A new change now launching in Google Search is designed to provide more site diversity in our results.” Google added, “This site diversity change means that you usually won’t see more than two listings from the same site in our top results.”
But not always. Google said it does reserve the right to show more than two results from the same domain name when it thinks it is appropriate. “However, we may still show more than two in cases where our systems determine it’s especially relevant to do so for a particular search,” Google wrote. I suspect this is related to branded queries, so if you are searching for a brand, like Amazon, you likely will see more than just two results from amazon.com listed in the search results.