Category Archives: New Books

Viral Loop

Adam’s new book, Viral Loop: From Facebook to Twitter, How Today’s Smartest Businesses Grow Themselves, tells the stories behind many of the iconic companies of our time, including Netscape, eBay, PayPal, Skype, Facebook, and Twitter. They all harnessed the power of viral loops to grow at incredible speed and achieve billion-dollar valuations in record time. Jeff Jarvis, author of What Would Google Do, wrote: “Penenberg discovers the perpetual motion machine for business and marketing… Buy this book. Catch a virus. Make a fortune.”

Go to to find out more about Viral Loop, the Facebook application, iPhone app and read interviews with the founders of viral loop companies.