Facebook Groups for Marketing & Finding Books

Okay, so I may have done this before.  I don't remember.  But here's a list of the Facebook Groups I've found and joined that you can use for marketing or just to find interesting books to read:

Amazon Kindle Goodreads - all genres
Indie Authors International - all genres
eBook World** - all genres

Self-Published Crime Fiction Writers - mystery, crime, thriller Crime,Thriller, Mystery Readers' Café - mystery, crime, thriller Kindle Unlimited - all genres in the Kindle Unlimited program Thriller Mystery Suspense Book Club - mystery, crime, thrillerThrillers Killers & Suspense - mystery, crime, thrillerKindle/ Book Club - all genres Mystery & Thriller Publicity Book Club - mystery, crime, thrillerIndie Sci Fi and Fantasy Book Promotion - SF/FFree Kindle Books - all genres as long as the book is freeThe Apocalyptic Book Club - dystopianKindle Krazy! Authors Actively Seeking Readers - all genres Band of Dystopian Authors and Fans* - dystopianDystopian Fantasy Bookworms* - dystopianEbook & Book Ads and Promotions - all genres Indie Writer Books and Self Promotion - all genres Book Reviews and Promotion - all genres
* special – see requirements before posting.** has to be approved before they’ll let the ad post
Read the pinned posts before you join the group to make sure it's a group you really want to be in and then follow their guidelines before you post ads to them.  Most of them don't want you to post more than once a day, which is only right.  Otherwise, it's spammy and no one wants that.  
I've had some minor successes here and there with these groups.  Can't hurt, right?  
Oh, and be prepared for your newsfeed to blow up with book ads and recommendations.  If you're like me, they'll be both annoying and exciting.  I mean, 'gah, so many book posts' and 'hey, previously unheard of books to read!' 
Good luck.