4. The method of claim 3 , wherein the filtering and normalizing step comprises: processing the obtained records to remove records related to restricted content.
6. The method of claim 4 , wherein the processing step comprises: selecting a record from the obtained records; matching 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; blocking the selected record when the substring of the selected record matches a listing within the first list; matching a substring of the blocked record against listings of a second list; and discarding the blocked record when no substring of the blocked record matches a listing within the second list.