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Re:Blocklist Facebook domains by nitemice on Tuesday March 20, 2018 @08:07PM (#16634024)
Looks like a good alternative if you can't get root. It uses VPN to blackhole requests. If you have root, I'd use AdAway[0] which changes the hosts file directly.

[0] https://f-droid.org/packages/org.adaway/

Re:Blocklist Facebook domains by vidyesh on Wednesday March 21, 2018 @06:15AM (#16636745)
Another great alternative is Blockada[1], it does the same as DNS66 and Adaway but in my experience does it felt much more reliable. It is available on f-droid[2]

[1]https://blokada.org/index.html

[2]https://f-droid.org/en/packages/org.blokada.alarm/