They personally review every site they block, and update the lists daily. Sites that are sent in by customers are reviewed by N2H2 Staff and if blocked they are added to the master database. N2H2 uses sophisticated search engines, Web crawlers, and other techniques to find sites that might fall into categories that they would want to block. Each site in that review list is then looked at by someone on their reviewing staff to determine if the site should be blocked. Only about twenty-five percent of reviewed sites are blocked.
New sites appear on the Internet daily.
N2H2's coverage of the Internet is unmatched in the industry. They have a department whose sole task is to create the block-access lists. Employees work seven days a week reviewing and rating sites. New filter lists are created every day. The lists are downloaded onto our N2H2 Server every evening after midnight.