The document traces the evolution of social media, highlighting Facebook's user growth from 50 million in 2007 to 800 million by 2011, while noting the impact of the introduction of the 'like' button in 2009. It details how companies use social media for brand engagement, customer service, and advertising, and outlines various services offered to manage social media presence and campaigns. A case study illustrates the successful use of social media to grow a fan base and increase website traffic for a vintage car importer.