17. The apparatus of claim 16 , wherein the processor configured to filter and normalize is further configured to: process the obtained records to remove records related to restricted content.
17. The apparatus of claim 16 , wherein the processor configured to filter and normalize is further configured to: process the obtained records to remove records related to restricted content. 19. The apparatus of claim 17 , wherein the processor is further configured to: select a record from the obtained records; match a substring of the selected record against listings of a first list, the first list comprising one or more search queries and URLs related to restricted content; block the selected record when the substring of the selected record matches a listing within the first list; match a substring of the blocked record against listings of a second list; and discard the blocked record when no substring of the blocked record matches a listing within the second list.