I launched Grateful Place last week and since then 31 people have signed up :) It makes me so happy and excited that people are going out of their way to create more positive energy in the world.
To help get signups, I've mostly focused on low-hanging fruit: posting here (thank you IH!!!), twitter, and Facebook. I also wrote a long technical essay about the framework I built that the site uses, though that probably only lead to two or three signups.
Next I'm going to reach out to more communities and individuals that are aligned with the purpose of the site (cultivate compassion, love, gratitude). I am also giving two conference talks over the coming months where I'll be sharing the site.