A little background on my app called Grain. The goal is to help millennials invest in what they know with who they know. We accomplish this with (1) a social aspect that lets you share ideas and trading activity with Facebook friends and (2) a discovery engine where users can find stocks and funds based on familiar concepts and keywords (e.g. - search "wearable tech" and results are Fitbit, Apple, Samsung, etc.).
Right now you can only interact with Facebook friends (investing with who you know). For our beta we want to onboard groups of more than 10 people that already know each other. We are already starting to reach out to university investment clubs. How else could we find and reach similar groups?