Each category Drop Links
Science fiction and fantasy
https://www.facebook.com/groups/scifiandfantasybookclub/
https://www.facebook.com/groups/indiescififanbookpromo/
https://www.facebook.com/groups/646965489384144/discussion/preview
https://www.facebook.com/groups/1433523283574154/
https://www.facebook.com/groups/1132459036786385/
https://www.facebook.com/groups/scififan/
https://www.facebook.com/groups/allthingsbooks.fantasyandsciencefiction/
https://www.facebook.com/groups/spec.fic.scifi.fantasy/
https://www.facebook.com/groups/hsfebooks/
https://www.facebook.com/groups/CelthricScienceFictionFantasyPromotion/
https://www.facebook.com/groups/294893704342302/
https://www.facebook.com/groups/1645239699135872/
https://www.facebook.com/groups/408370416164228/
https://www.facebook.com/groups/9990182714/discussion/preview
https://www.facebook.com/groups/247565989202228/
https://www.facebook.com/groups/117953801726361/
https://www.facebook.com/groups/538650292928561/
apocalyptic
https://www.facebook.com/groups/apocalypticbookclub/
https://www.facebook.com/groups/715765121825692/
https://www.facebook.com/groups/441915460198124/
https://www.facebook.com/groups/1915771882059501/discussion/preview
https://www.facebook.com/groups/362069600661308/about