Have you checked out the Agile Uprising Coalition yet? If you haven’t, you should. According to their website, they are a “purpose-built network that focuses on the advancement of the agile mindset and global professional networking between and among practicing agilists.”
I check out Agile Uprising regularly to see what my fellow agilists say about things like Mike Cohn’s new Better User Stories course, to see how everyone is measuring flow efficiency in Kanban, or to listen to podcasts (They interview great minds in the industry).
There are plenty of other forums out there (I belong to several), but this one seems to be an open and effective way of sharing thoughts in the agile space.