This document provides a summary of key SEO factors from 2011 and trends to watch in 2012. In 2011, Google's Panda update targeted sites with duplicate, thin, and poor quality content. Mobile search grew substantially as mobile usage doubled. Facebook continued rising as a dominant social network. Google integrated more social signals and data into its algorithms. Google launched Google+ and expanded it to businesses. Google also increased the percentage of search results considered "fresh" based on various factors. Duplicate content and proper use of pagination remained important factors for sites to address. The document concludes by outlining some key SEO trends to watch in 2012.