From a small business perspective, case study #2 is not feasible. Overall, though, this post features some very good examples of what you can achieve if you take the time to study the Reddit user base.
The social media platform is notorioous for being anti-self-promotion. So anyone who is able to get traction as an entrepreneur deserves some kudos.
Via Cendrine Marrouat - cendrinemarrouat.com, Os Ishmael