I use the groups and permissions mechanics extensively in my applications. 
They're useful for lots of stuff. Sharing can be as simple as giving 
permission for a record. I also use tags for the same purpose but they're 
better for stuff which will be changing based on properties of an entity 
instead of explicit permissions. I think there should be both. Note that 
RBAC is kind of a standard that people understand, and while you can 
implement it with tags it's not so straightforward and easy to understand 
in practice because tags tend to originate a kind of spaghetti that makes 
understanding how the system works murkier.  

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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