The document discusses the opportunities for marketing through social media platforms by highlighting key statistics about their massive user bases. It notes that Facebook has over 900 million users, with 488 million using mobile devices. It also shares that 400 million tweets are sent per day and that 76% of the world's population owns a mobile phone. The document promotes using these social media platforms like Facebook, Twitter, LinkedIn, blogs, YouTube, Flickr and Instagram for marketing. It concludes by recommending responsive web design to make sites accessible on different devices.