@dajbelshaw @bonfire @Supernova @ivan how about using terminology of a campfire? Something like campgrounds for boundary? Users may be more familiar with the naming more than abstract nature of the word boundaries.
Circle I think makes sense. But due to social network nomenclature, maybe group or camp members would work better? If you want individuals to understand what they are using, similar verbs may be necessary for similar concepts. Otherwise, it can produce confusion regardless of the intention for simplicity or clarity.
+bonfire Getting too metaphorical is risky. Personally I never go camping, and have no idea what campgrounds are.
I agree boundaries is not an ideal term, but not because it is abstract, it just doen't fit 100%. Bounded posts are not changing their shape, or growing or shrinking in size. They have certain rules about who can see and interact with them. It is like every post can be its own little forum. My suggestion would be rules or access.
