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.
There are a lot of ways to measure site diversity, and we’re going to dive pretty deep into the data.
Read more: https://moz.com/blog/did-googles-site-diversity-update-live-up-to-its-promise