9. The one or more tangible computer-readable media of claim 7 , wherein the created second version of the blending algorithm is preferred by the users who receive the generated interleaved set of search results.
11. The one or more tangible computer-readable media of claim 9 , further comprising: varying the first parameter of the second ranking system to create a third version of the blending algorithm that produces a third set of the blended search results based on the search query; interleaving the produced second set of the blended search results and the produced third set of the blended search results to generate a new interleaved set of search results; performing the interleaving experiment for the search query using the generated new interleaved set of search results; and based on the performed interleaving experiment, determining which of the created second version of the blending algorithm or the created third version of the blending algorithm is preferred by the users who submit the search query.