An entity is made the target of a communication—such as instant messaging, E-mail, or VoIP—based on a specification of context that the entity satisfies. A user (or other type of entity) who wishes to communication with one or more entities that satisfy a particular context specifies that context at the time the communication is to be sent. A system resolves the context by ascertaining which one or more entities satisfy the context, and the communication is sent to the ascertained entities. In one example, a user can specify that a message is to be sent to an entity at a particular geographic location, and the system chooses the one or more entities that are nearest to the specified location.