The document discusses the emerging challenge of social networks and why businesses should utilize them. It defines social networks as internet services focused on relationships like Facebook and Twitter. It notes that over 400 million people use Facebook and people spend more time on social networks than other sites. The document also states that 91% of US businesses are trying to use social media for promotion in 2010 as alternatives like newspapers and radio decline. It argues that social networks can help businesses promote themselves at a lower cost and connect with the right audiences.