As a user, how do I revoke access for a particular agent?

[Joshfairhead]

Situation: I no longer wish to share data with a particular agent.

Answer: This can be done in several ways, the easiest of which is to navigate your social graph/list to the agent whom you wish to revoke or attenuate the capabilities of and do so that way. You could also view your capabilities list directly and find the capability you wish to revoke/attenuate in relation to the agent.