In the SEO community, Google Possum is the nickname given to one of the algorithms that Google released in 2016. This algorithm is unlike the others as it does not index and rank webpages. Instead, it crawls through Google Maps and Local Finder to identify and remove spam.
This algorithm is just one of several bots used by Google to keep its search results as reliable as possible for its users. For SEO marketers, the algorithm is considered useful, as it delegitimises underhand marketing techniques and protects their marketing efforts from spam, disruption, and interference.