There are over one billion web sites on the Internet, with thousands of pages being added every day. If you are lucky enough to have access to the Internet in the classroom, there are a number of strategies that you can use to provide a safe surfing environment for students. Look for web sites that have used a rating service to evaluate the appropriateness of their content. If a site has been rated, the web manager will often place a graphic to indicate it.
Content is always changing, so a visual check of the web site is still important.
Another strategy is to use a safe surf program. Safe surf programs filter out web sites that contain objectionable material through keywords. The same type of words you would enter into a search engine. The software searches through the content of a web page before the web surfer has access to it. The problem with these programs is topics may have an obscene homonym that was missed by the filter.