This document discusses how social networks can impact search engine rankings both directly and indirectly. Direct impacts include links and mentions on social media influencing crawling and rankings. Indirect impacts include increased visibility, brand awareness, and positive user signals leading to greater trust and rankings over time. The document provides examples of how to leverage different social networks like Google+, Twitter, LinkedIn and more to expand one's network and increase reach. It emphasizes that search is no longer just about SEO but combining social, content and other strategies.