Block youtube and facebook for certain pc's not all

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Blocking YouTube blocks other Google services

OpenWrt 19.07.5 Issue: Blocking YouTube on the firewall is blocking Google Docs and Hangouts Context: I followed the instructions here to configure firewall reject rules for YouTube, Discord, and Twitch because my kids are doing remote school full time using Chromebooks. The problem is they are distracted by Chrome tabs open to the sites mentioned. The rule works fine blocking Twitch and Discord but YouTube is blocking more than YT. Is it possible to only block YouTube?

Blocking Facebook

Hi all New to OpenWrt as well as Linux, but I am loving Linux (MXLinux is my main OS) Anywayyyy I would like to block facebook completely. There is http facebook and https facebook. I understand that there is a big difference. That being said, Do I go into Network --> Firewall --> Custom Rules ?? If so, what am I typing in there? I really really really want to block any and all access to facebook on my network, even if it is through an android or an iOS app.

Then provide a separate DNS for those who shouldn't be blocked, or the other way around.