Enforce Safe Search on Search Engines
This feature should be turned on by default for new users. When turned ON, all search engines should be blocked except those where we can enforce “safe search”.
Some of the search engines might have a way of choosing between moderate or strict filtering. It would be nice to allow user to choose between moderate or strict setting for those search engines which have a way of choosing.
All search engines except these should be blocked. (Links may have info you need for enforcing safe search.)