Methods and apparatuses that collect tracking data items into a plurality of data stores for one or more domain in response to resources received from the domains are described. Each tracking data item may be accessible for one of the domains. Relationships of the domains may be identified among the tracking data items across multiple data stores according to the resources received. One or more of the domains may be selected according to the identified relationships to control accessibility of the tracking data items for the domains. The data stores may be updated to prohibit accessing at least a portion of the tracking data items for the selected domains.