As someone who has a lot of experience in social media marketing both through apps- and other areas: If you're asking for help you're wasting your time. Rather focus on making a product or structuring the product so that others WANT to share it. Which results in viral-ity. If you're marketing plan even slightly focuses on "asking others to help" you're doomed from the start. -obviously this doesn't apply if you allow for an intrinsic benefit of others (example: Tor encourages users to share in order to better mask secrecy).