You have to understand the process a cell phone uses. If you are the user and not controlled by a remote application such as the BES service a company uses there is not much you can do to stop anyone using the BB if they go to sites you feel are trouble. The filter on the BB is designed to allow users to filter out email. The basic premise is if you own it you control it. If your company owns it they control it.
I was not able to find any support on RIM's site. You might try a third party application. check Blackberry AppWorld.
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