Just as the dust seemed to be settling following Google's original Penguin update, which rolled out about a year ago, the search engine giant has unleashed a major sequel. Penguin 2.0, which is also being called Penguin 4, debuted on May 22. Due to the fact that it's still in its infancy, its far-reaching implications remain unclear. Still, a few things are apparent. This update seeks to drive home the fact that Google is out for sites that use black-hat SEO techniques. Like its predecessor, Penguin 2.0 is especially touchy about backlinks. Most importantly of all, it appears to have had a huge impact on local search results already.