system
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Yeah, they do, however they give completely false impression that the URL will be blocked regardless of the protocol used. It will only be blocked for http:// - you can check this by going to https://www.facebook.com/. Similarly, FTP will not be blocked either. Also, your example actually make sense, while the OP’s list does not. I guess he thinks avast! is doing some content filtering, well no it doesn’t, it only checks the URL.