For Facebook at least, we are currently planning to use scope as a 
comma-separated list of permissions from this set: 
http://wiki.developers.facebook.com/index.php/Extended_permissions

For instance:

        oauth_scope=read_stream,email,photo_upload

I'm not sure if that maps to realm exactly.

On Apr 6, 2010, at 8:03 AM, Dick Hardt wrote:

> 
> On 2010-04-06, at 12:16 AM, Eran Hammer-Lahav wrote:
> 
>> 
>> 
>> 
>> On 4/2/10 3:27 PM, "Dick Hardt" <[email protected]> wrote:
>> 
>>> There are times when a resource may have different scope for different kinds
>>> of access. realm != scope
>> 
>> No. Realm is a subset. It is what people define as the protected segment
>> name.
> 
> Different Protected Resources could require the same scope, so I see realm 
> and scope as being orthogonal.
> 
>> For any other scope attribute we need to first define it.
> 
> Why? Scope will often be application specific.
> 
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