Methods, systems, and apparatus include computer programs encoded on a computer-readable storage medium, including a method for providing content. A script is received for execution when a resource is rendered on a client device. The script is stored. A request for the resource is received that includes a token identifying a requesting source item that was interacted with by a user to generate the request. The script is executed. A determination is made as to when fixed or recyclable contact information associated with a content sponsor of the resource should be provided with the resource. When recyclable contact information should be provided, the information is requested from a service including providing the token to the service. Recyclable contact information for the content sponsor and time-out information are received and stored. The identifier is stored on the requesting device. The resource and recyclable contact information are provided responsive to the request.