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Penguin is a filter designed to capture sites that are spamming Google’s search results in ways that Google’s regular spamming systems might not detect. Introduced in 2012, it has operated on a periodic basis.
Penguin becomes real-time. As Google recrawls and reindexes pages — which happens constantly — those pages will be assessed by the Penguin filter. Pages will be caught and/or freed by Penguin as part of this regular process. With this change, Penguin’s data is refreshed in real time, so changes will be visible much faster, typically taking effect shortly after we recrawl and reindex a page. Penguin becomes more page-specific, not site wide only
Penguin is now more granular. Penguin now devalues spam by adjusting ranking based on spam signals, rather than affecting ranking of the whole site. Penguin might impact specific pages on a site, or it might impact sections or wide swaths of a site, while other pages are fine.