From owner-freebsd-questions@freebsd.org  Sun Aug 20 18:49:29 2017
Return-Path: <owner-freebsd-questions@freebsd.org>
Delivered-To: freebsd-questions@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id A8B57DE5E1D
 for <freebsd-questions@mailman.ysv.freebsd.org>;
 Sun, 20 Aug 2017 18:49:29 +0000 (UTC) (envelope-from johnl@iecc.com)
Received: from miucha.iecc.com (w6.iecc.com
 [IPv6:2001:470:1f07:1126::4945:4343])
 (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
 (Client CN "miucha.iecc.com",
 Issuer "Let's Encrypt Authority X3" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 7A0E06ED71
 for <freebsd-questions@freebsd.org>; Sun, 20 Aug 2017 18:49:29 +0000 (UTC)
 (envelope-from johnl@iecc.com)
Received: (qmail 10222 invoked from network); 20 Aug 2017 18:49:28 -0000
Received: from unknown (64.57.183.18)
 by mail1.iecc.com with QMQP; 20 Aug 2017 18:49:28 -0000
Date: 20 Aug 2017 18:49:06 -0000
Message-ID: <20170820184906.4869.qmail@ary.lan>
From: "John Levine" <johnl@iecc.com>
To: freebsd-questions@freebsd.org
Cc: rsmith@xs4all.nl
Subject: Re: How to block facebook access
In-Reply-To: <20170820153621.GA9420@slackbox.erewhon.home>
Organization: 
X-Headerized: yes
Mime-Version: 1.0
Content-type: text/plain; charset=utf-8
Content-transfer-encoding: 8bit
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 20 Aug 2017 18:49:29 -0000

In article <20170820153621.GA9420@slackbox.erewhon.home> you write:
>I would hazard a guess that *most* facebook users wouldn't be technically
>savvy enough to use an IP-adres.

Even if they are, FB will redirect them to a name.  They'd either have
to use an external DNS cache or a VPN.  I suppose one could preemptively
block port 53 requests out to 8.8.8.8 and 8.8.4.4.

R's,
John