Don't want to force anyone into a certain mode, or leave out others, but I've made a google+ circle for "Photostock UP". I have Marc and Bill there, and found Tom, Sean, and Andrew and added them if they elect to add me to their g+ accounts. I'll be checking there as well as email and APUG.
Google+ is now open to everyone, in case that's a concern. I know some folks object to google or social networking on principle.