I never knew there was horror Facebook pages or groups. I don't use Facebook often, it might be why I never came across any of them.

It's on Reddit that I've joined so many subreddit based on horror movies, TV shows and books. 

Posted by: @shiek

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This is the horror movies page that I'm following on Facebook. They don't post everyday but when they post, it's a very good content. 

https://www.facebook.com/HorrorHorrorHorror?mibextid=kFxxJD

This is their latest post https://www.facebook.com/share/p/aq32HttTMKyawKpB/?mibextid=qi2Omg

I will check this page. I love to read horror contents too. They are even trying to post contents for people to read which I know that it doesn't come easy to think critically and write them down.