You know it's essential these days that authors market their books, and social media is often the most cost-effective way of doing that. Now, Pay with a Tweet lets you utilize the value of your readers' social networks to spread the word about your new books. You create a button for your website or blog  that leads to a free download (say, the first chapter of your new book) that readers get after they Tweet about you or mention you on their Facebook page. So instead of hoping your giveaways create a buzz, now it's guaranteed!