I'll start first: Facebook Ads. We've realized it's simply too early to advertise there (most SaaS companies were optimizing for 12-20 months return on investment, so they could allow to spend much more to acquire a customer). What about you?

I'm trying to see what clever ways people here have tried to get their first set of users for their product. Immediate network is an obvious choice but beyond that, what creative ways have people found success when getting their first set of power users?