Libro.fm shared this challenge on their instagram page.  Any prompt that can't be directly linked to a book (e.g. "Recommend an audiobook on social media") has been marked as a bonus prompt in The Storygraph challenge (meaning, you don't need to complete those prompts to complete the challenge here).  Disclaimer: This challenge was created by Libro.fm, not me.  I am simply transcribing here so that I (and others) can participate and track our progress!