This is quite interesting. But a lot of sites tell you how you are going to fulfil different tasks and get earnings but they don't really follow through. Now that discourages more people. A referral program will run effectively in bringing about the growth of the app if you stick to your end. And for marketing, go wild. If you are employing social media networkers I'm more than available to render my services.

How will this project benefit investors?

Creating a project for the youngsters to look at is quite okay but if you are going to get an admin and a contributor to work with you on that, you need to consider involving a payment of some sort for services rendered.