Most major search engines get their listings by crawling the web, rather than through human review and categorization, as with the sites listed above. This means its easy for possibly objectionable material to appear in search results.

As a solution, most major search engines offer some type of filtering ability. It's meant to keep out porn content and other material that most might not want children to encounter.

These filters are not perfect. Some material does get past them, and some safe material may get filtered out. To understand more about this, see the Harvard Criticizes Google's Adult Content Filter article that ran in our SearchDay newsletter in April 2003.

AllTheWeb: Use the Basic Settings page to enable the Offensive Content Filter option. The only works for searches in English.

AltaVista: Use the Family Filter Setup page.

AOL Search: Doesn't appear to offer a filter, but enabling Parental Controls might have an impact on web search matches.

Ask Jeeves: Use options for