Social media marketing utilizes online platforms and communities to spread information through virtual word-of-mouth. It allows for the sharing of ideas, information, and media. The document discusses how companies like Zappos use social platforms like Twitter to update customers, provide support, and communicate internally. It notes that creating viral social media content is a powerful marketing tool, especially as more users join online communities each day. Both the opportunities and risks of social media are examined, including how it can improve communication but also lead to distractions or privacy issues. Overall, the document advocates for social media use, noting its present and future importance as well as the need to compete on these growing platforms.