This is great ebook on understanding the elements that make for a good social proof. Great examples and illustrations. I recently published an ebook on the same subject matter titled "What is Social Proof?" In my ebook i cover the basics of what is social proof, Understanding User behaviour when they are visiting your website online. What is Fear of missing out FOMO and how to create a sense urgency among your online visitors using WebsitesToolz social proof tools. Finally i have explained several use cases using social proof tools from www,websitestoolz.com Do check out my ebook at this link https://appsumo.com/products/marketplace-what-is-social-proof/