We just launched it. It's live. LightPainters.com
When the sites out there just don't cut it, and you have the means, you build your own. There were a lot of reason that Facebook was falling short for us, so we did just that.
The development work was a few hundred hours of my time since November. Working with 
My company, Carbon Creatures can offer private sites like to those in need, and a big shoutout to Nancy Nguyen for her amazing logo design!