While Proxy servers do a good job in blocking access to restricted sites, most of them actually require administrators to manually add the restricted URL's inside the Proxy configuration. It is virtually impossible to document all sites and/or web pages that have material that might be considered inappropriate for the instructional setting. One thing i would do recommend is using some kinda surf control product along with the proxy to provide advanced filteration options and also to keep the proxy list for questionable sites updated.
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