Having been pretty much offline for a while, I'm catching up on the site's evolving features.
I see the Sitter's Schedule at http://www.treeleaf.org/forums/calendar.php and Treeleaf Sangha at https://plus.google.com/u/0/communit...18127851430086.
Although it took me a minute to work out the basics, I've joined one and remembered to invite Treeleaf Sangha to a couple of zazen google hangouts.
From context, I've tentatively concluded that the Sitter's Schedule times are adjusted to my local time settings. I'll know for sure soon enough.
This is about the extent of my current grasp of the feature set.
So, what's the current best practice for posting practice times without unintentionally spamming? I'm a computer programmer, but social networking largely mystifies me.