Most people by now have heard of the “Product key activation event”. More generally, Facebook’s 7 friends in the first 10 days, Twitter’s 30 followers… get lots of mentions in the Product and Growth communities. Theses examples have helped cement the idea of statistically determining goals for the onboarding of new users. A few weeks ago, somebody from the Reforge network asked how to actually define this goal and I felt compelled to dive deeper into…