We used this tactic as a growth hack in our early days (2016), and it worked great! It also inspires sharing on Twitter, which helps drive the recommendation f

We used this tactic as a growth hack in our early days (2016), and it worked great! It also inspires sharing on Twitter, which helps drive the recommendation flywheel: https://twitter.com/tdnvl/status/722882182759452675 https://twitter.com/tdnvl/status/722882182759452675 The trouble is that it isn't easily scalable in-house at high volume. It was great until we realized that we were managing a large scale mailroom. But by then the flywheel was spinning ...