A best-selling social media marketing book from a best-selling author on Internet marketing: Jason McDonald. Social media is big - really big. Facebook has over 1 billion users, and LinkedIn has over 350 million. Today's customers go online to review sites like Yelp and Google+ to check out businesses before they engage. Whether it's on Twitter, on Instagram, on YouTube, or even Pinterest, your customers are "on" social media and they are talking about businesses, products, and services just like yours. Small businesses and large businesses alike can leverage social media for amazing free marketing opportunities.