Rio Tinto is a global mining company with over 102,000 employees in more than 50 countries. It has net earnings of US$6.3 billion in 2009 and a market capitalization of £57 billion as of April 2010, larger than several major UK retailers combined. The document discusses Rio Tinto's investor relations and use of social media platforms like Facebook, YouTube, and blogs to communicate with investors and manage its reputation.