It's not too late to join in with your own suggestions, but here are just a few:
He Who Shall Not Be Named is Just Not That Into You. #PotterABook
— Bry (@ChiGuyBry) March 2, 2017
What to expect when you're expecto patronum #PotterABook
— Tyler Davis (@WmTylerDavis) March 2, 2017
Hagrid Hears a Who #PotterABook
— Carrie Roberts (@croberts34) March 2, 2017
The Fault in Our Scars #PotterABook
— ℛice (@shutupmeghan) March 2, 2017
The Cat in the Sorting Hat #PotterABook
— Emily Ecker (@EmilySEcker) March 2, 2017
The Chaser in the Rye #PotterABook
— D. Shah (@hobo12395) March 2, 2017
Oh, The Places You'll Apparate #potterabook
— Lizzie K (@SparkOfInsanity) March 2, 2017
Ollivander and the Terrible, Horrible, No Good, Very Bad Day #PotterABook
— Chamorrita Girl (@_prettybaaaby) March 2, 2017
Quoth the Raven, Pottermore #potterabook
— B&N Teen Blog (@BNTeens) March 2, 2017
A Series of Unforgivable Curses #PotterABook
— Dear Zombie Diary (@DearZombieDiary) March 2, 2017
Lord Voldemoort of the Flies #PotterABook
— Jeanmarie Anaya (@jeanmarieanaya) March 2, 2017
Wind in the Whomping Willows #PotterABook http://pic.twitter.com/BjLLqEDiVX
— Aviatrixt (@Aviatrixt) March 2, 2017
A Brief History of Time-Turners #PotterABook
— Courtney Gorter (@elleohdee) March 2, 2017
The Lion, the Snitch, and the Wardrobe #PotterABook
— B&N Kids Blog (@BNKids) March 2, 2017
Jane Heir of Slytherin #PotterABook
— Courtney Gorter (@elleohdee) March 2, 2017
It's possible Barnes and Noble started this earlier in the day with this tweet:
Congrats to everyone, because there is some brilliant work happening here. Accio your imagination, and tweet out your own Potter titles.Because half our brains are Harry Potter fact storage, today we're playing #PotterABook! We'll start: A Wind in the Dumbledore
— B&N Teen Blog (@BNTeens) March 2, 2017
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