In early May multiple fluctuations were observed in search results.
After initially denying the release of a new update, on May 19th Google finally confirmed that they released an update which affects search engine rankings.
This update is a core engine update rather than a penalty update, and it changes the way Google assesses the quality of content found on web pages.
Beyond the general announcement regarding webpage quality evaluation changes and the update’s impact on all website types – no information leading to proper action steps was received.