To give some context, we indeed make these "side projects" hoping to drive signups and engagements to our core projects (Mailbrew and Typefully), but we always do them with the same care of main project, focusing on utility and user experience.
Typefully itself, now an essential part of our business, was born as a Mailbrew side project.
Even Feeds Mage, while it may appear silly to some people, could actually be further developed to become a great discovery tool for the Twitter social graph. In a way these projects are always also long terms bets for us, even when they're small bets that took 2 weeks to build, like in this case.