Google pre-announced a "site diversity" update, claiming it would improve situations where sites had more than two organic listings. Moz data showed that, while the update did marginally improve SERPs with 3-5 duplicate sites on page one, the impact was relatively small.
- Did Google's Site Diversity Update Live Up to its Promise? (Moz)
- Google search update aims to show more diverse results from different domain names (SEL)