15. One or more tangible computer readable storage media storing computer-executable instructions for performing a computer process, the computer process comprising: receiving a request from a source to access content of a target Web domain, the request being addressed to a domain address of the target Web domain; retrieving historical relevance data associated with at least one previous request from another source to the target Web domain from a database; identifying a new content Web domain that is determined to be relevant to the request based on a combination of the domain address of the target Web domain and the historical relevance data, the historical relevance data including one or more context factors collected from the at least one previous request to the target Web domain; and redirecting the source to access advertising content of the identified new content Web domain, responsive to the request.
15. One or more tangible computer readable storage media storing computer-executable instructions for performing a computer process, the computer process comprising: receiving a request from a source to access content of a target Web domain, the request being addressed to a domain address of the target Web domain; retrieving historical relevance data associated with at least one previous request from another source to the target Web domain from a database; identifying a new content Web domain that is determined to be relevant to the request based on a combination of the domain address of the target Web domain and the historical relevance data, the historical relevance data including one or more context factors collected from the at least one previous request to the target Web domain; and redirecting the source to access advertising content of the identified new content Web domain, responsive to the request. 23. The one or more tangible computer readable storage media of claim 15 wherein the context factors include source context data collected from a source of at least one previous request to the target Web domain.