8. A system effective to determine a rank of a URL for a search query, the system comprising: a memory; a processor in communication with the memory; wherein the processor is effective to receive a search query; receive a URL; send the search query to a search engine; receive a first result set from the search engine; determine a first rank of the URL in the first result set; receive a second result set from the search engine; determine a second rank of the URL in the second result set; determine a third rank of the URL for the search query for the search engine based on the first and second result sets and the first and second ranks; determine a variability of the third rank of the URL for the search engine based on the first and second result sets and the first and second ranks; generate a report including the third rank and the variability of the third rank by the processor; and store the report in the memory.
8. A system effective to determine a rank of a URL for a search query, the system comprising: a memory; a processor in communication with the memory; wherein the processor is effective to receive a search query; receive a URL; send the search query to a search engine; receive a first result set from the search engine; determine a first rank of the URL in the first result set; receive a second result set from the search engine; determine a second rank of the URL in the second result set; determine a third rank of the URL for the search query for the search engine based on the first and second result sets and the first and second ranks; determine a variability of the third rank of the URL for the search engine based on the first and second result sets and the first and second ranks; generate a report including the third rank and the variability of the third rank by the processor; and store the report in the memory. 10. The system as recited in claim 8 , wherein: the processor is a first processor, the system further comprises a second processor in communication with the first processor, and wherein: the first processor is effective to send the search query to the data center; send the search query to the second processor; determine a first rank of the URL in the first result set for the search query; the second processor is effective to receive the search query from the first processor; send the search query to the data center; receive the second result set from the data center; determine a second rank of the URL in the second result set for the search query; and one of the first and second processors are effective to determine the third rank and the variability of the third rank based on the first and second rank.