All groups within the TAP virtual world can be thought of as communities - as one thinks about a community within our present physical "real" world.
Groups can easily exist within TAP that represent real-world communities. The problem then becomes one of the inclusion and exclusion issue that readily exists in our real world. TAP does NOT exist to replicate the problems that exist in today's world. Instead it exists to eliminate many of the problems today's world have - because of its design and rules.
TAP will allow for private groups to exist within it. But these will be in the minority. More will exist in the initial stages of launching TAP - when people do not fully understand TAP. There are practical applications for private groups within TAP. A simple example is a family unit - as a family unit is understood and defined in today's world. But YOU will soon learn that even "family units" change in the TAP world.
The very best way to teach something new is to have the target audience ask specific questions along a new understanding flow path. This versus me just spewing out new information as I see best. I'm actually the very worst candidate to act as teacher. My more detailed understanding can often cause me to fluff over very important new concepts. Things I take for granted but the audience has little to no understanding of. Because of this issue, I encourage Nina (with help from YOU) to direct me within the educational flow concept.