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Coming from one of the first counties to get computers, it is a real problem. When we started they told kids to use it all, and they did. They download music, videos and all. The county went overboard in restricting access and then we couldn't get what we needed. There are better systems in place now, but restrictions are necessary.
See slides 49-56: http://www.slideshare.net/datruss/the-pods-are-coming
to see in simple terms why I think filters filter learning.
Credit to Kathy Sierra for the first image, on slide 49, adapted with the word 'filters' added to it. She gets credit in an earlier slide.