Hi All! We’ve been working on a plugin that will be really useful to Corona devs.
It automatically adds a facebook+sms invitation flow, a push notification system, daily rewards, and other features to your app that you can pick and choose from. So you can focus on making a good game and we take care of all the distribution & retention features.
If you’ve looked at most of the top grossing games they’ve already built most of these features in-house, but its been too much work for most indie developers. It’s definitely a problem we had when working on our own games. Fortunately this is a problem we’re going to solve 
We’re still deciding on a price point once we release it, but it’ll be free for anyone who’s on the waiting list or a beta user.
Please check it out and let me know if you have any thoughts/questions!