Here are the top 10 things you need to know. 1. Penguin is all about spam As a refresher, Google's Penguin algorithm is designed to identify spammy sites that slip through Google's other filters. It was first launched in 2012, and the last update was rolled out in October 2014. 2. It's real-time As Gary Illyes of Google's Search Ranking Team explained: "Historically, the list of sites affected by Penguin was periodically refreshed at the same time. Once a webmaster considerably improved their site and its presence on the internet, many of Google's algorithms would take that into consideration very fast, but others, like Penguin, needed to be refreshed. 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. " Get the full story at Econsultancy Read also "Google says Penguin recoveries have started to roll out now" at Search Engine Land