Book stack challenges are a fun feature of Bookstagram. There are constantly challenges about color, pattern, title, etc. It’s really fun to see all the different and creative ways people organize their books.
The first book stack challenge I participated in was for colorectal cancer. March is colorectal cancer awareness month. A fellow bookstagrammer did a fundraiser for every blue book stack that was posted. I took part in this book stack challenge for a cause for personal reasons as you can read in the Instagram post below.