Users form custom-defined communities for performing a defined activity amongst themselves. An actor defines the activity and restrictions associated with the activity. Members of the community place requests for the actor to perform member-specific actions during the activity on behalf of the members. The actor performs the activity with the member-specific actions and arranges procurement of results associated with each of the members. The actor and the members may also settle up with one another at least upon procurement. The activity is crowd sourced within the custom-defined community, thereby reducing the need for the members to each individually perform the activity.