I saw a reference recently to a site, www.bookmovement.com, that I hadn't heard of in all my trolling for book-related stuff. So I'm sharing it in case you haven't heard of it either.
Book Movement is a site for book clubs and allows clubs and members to list and rank the books that they're reading. So the site turns that into lists of the popular books among book clubs.
I searched a couple of African American authors names - by no means an exhaustive list, just a casual search.
Here's what I found on the site - titles by:
I didn't see anyway for authors to feed in to the system - other than paying for featured placement. But perhaps it would be a tool worth mentioning to fans in book clubs.