What we need is a model similar to Google+ circles if anyone can remember that. Basically a thing that I could assign 1) apps and 2) content to. Apps can acces

What we need is a model similar to Google+ circles if anyone can remember that. Basically a thing that I could assign 1) apps and 2) content to. Apps can access all content in all circles they are assigned to. Circles can overlap arbitrarily so you can do things like having apps A,B,C share access to documents X,Y but only A,B have access to Z etc.