Whenever I see talk about onboarding new users, I giggle a little. This is coming from people that are very deep in the system and network.
I did some light A/B testing, by bringing friends over. Both times, they ended up not using it anymore - the latter even got harrassed on their very first note because they shared their furry art. Cool, very welcoming. x)
Onboarding isn't the biggest issue (but definitively one). There is a slightly bigger one that people in a bubble are prone to overlooking (me included). Can you see it?