I'm on the borderline concerning filtering systems. Some filter systems block all use of sex, penis & vagina. Suppose somebody wants to do a health research paper on STDs. Lets suppose the library has only two books on the subject. One can find dozens of places online to gather STDs information. Unfortunately, the library computer won't allow them access to the sites because the word "sex" is there.
The local library has only one computer for research use & you have to sign in & out to use it plus putting down what the computer is being used for. They won't let kids under 15 use it unless they have a parent with them. That works better than any filtering system.
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