作者提出了一套理论来解释成功的 app，尤其是成功的聊天类的app为何让用户上瘾： The Hook is composed of a trigger, action, variable reward, and investment.
So how do you know you might be a great founder? Well you should have some super powers. It's generally speaking useful to be a good product person. It's useful to have good skills about leadership, bringing networks in, persuading people, and it's useful to be able to- and this is kind of fundamental, is recognized whether you are on track or not. To have that kind of belief but also paranoid about am I tracking against my investment thesis? And when you do that the right way and you are learning and you are assembling people and you are assembling that around you.