We normally do full activities, but after some prodding, I've begun implemented the forth-coming FEP about context vs contextHistory. So now the default context is objects for Create|Update|Delete Note|Article and activities for everything else, and contextHistory is full activities for everything associated with the opening post-of the conversation; but what a nightmare...
We do not typically provide URLs as collection members, because you may need a signed activity to access and validate third-party objects which have source access control enabled.
We normally do full activities, but after some prodding, I've begun implemented the forth-coming FEP about context vs contextHistory. So now the default context is objects for Create|Update|Delete Note|Article and activities for everything else, and contextHistory is full activities for everything associated with the opening post-of the conversation; but what a nightmare...
We do not typically provide URLs as collection members, because you may need a signed activity to access and validate third-party objects which have source access control enabled.