You could read the Fast Company article on viral loops, but that probably won’t really help you understand how to use one to add, say, 5,000 buyers to your list in 3 months. You’ll probably be better off joining Justin Blake’s new, free Subscriber Virus membership site and see how he’s actually doing it.

This one intrigued me because of how Justin is working the signup process. But I don’t want to spill the details—I’ll just let him tell you about it.