18. The computing device according to claim 17 , wherein the page selection component is further executed on the processor to apply the model to selecting the subset of web pages for indexing from the plurality of crawled web pages based at least in part on relative priority relationships for the crawled web pages determined from the user behavior information.
18. The computing device according to claim 17 , wherein the page selection component is further executed on the processor to apply the model to selecting the subset of web pages for indexing from the plurality of crawled web pages based at least in part on relative priority relationships for the crawled web pages determined from the user behavior information. 19. The computing device according to claim 18 , wherein the page selection component is further executed on the processor to apply the model to selecting the subset of web pages for indexing from the plurality of crawled web pages based at least in part on features extracted from the plurality of crawled web pages, the features comprising at least one of: ranking features, URL features, click features, graph propagation features, or document features.