The document discusses Facebook, the largest social network with over 600 million users. It describes Facebook's origins, mission, growth, headquarters, competitors, and valuation. Key opportunities for Facebook internationally include reaching a global user base where over 60% of users are outside the US and Canada, expanding into 89 languages to better serve international members, and attracting more international advertisers as it grows its user base worldwide. However, Facebook also faces challenges around security risks, protecting user privacy as its business model relies on user data, and providing sufficient customer support for its large user base.