On the fourth Wednesday of January each year, libraries and readers across social media share selfies with bookshelves and tag them #LibraryShelfie! It's a fun way to share a love of libraries on social media. This year marked the fourth annual #LibraryShelfie Day, and as always, libraries and readers all over social media shared some amazing pics!

These are just 12 of our favorites that we spotted today—we had a lot of trouble narrowing it down from all of the great pics people shared! You can explore way more amazing shots on Instagram and Twitter!

WAIT #libraryshelfie is a thing??! THIS IS A THING THAT IS TOO GLORIOUS. Here is my library and here maybe is me. I was born without a head. pic.twitter.com/Y5MqPzNygg

— Cait (@PaperFury) January 25, 2017

Of course the #libraryshelfie is not an entirely new phenomenon ... pic.twitter.com/NVZYuUkLXC

— Simon Miller (@SimonMiller11) January 25, 2017

Flat out here at @NTLibrary today! #libraryshelfieday #libraryshelfie #shelfie pic.twitter.com/xerFGEDtUL

— Caddie Brain (@CaddieBrain) January 25, 2017

Happy #LibraryShelfie day! Now back to #werk #werk #werk #werk... pic.twitter.com/yqQSehLg7l

— BKLYN Library (@BKLYNlibrary) January 25, 2017

Today is #LibraryShelfie Day! Take a selfie with a bookshelf and tag it #LibraryShelfie to spread the library love. pic.twitter.com/SBEXDzzw6A

— Parkchester Library (@PKRLibrary) January 25, 2017

A throwback #libraryshelfie from 1962 starring Parsons School of Design #librarian Jadwiga Pulaska in old library on 54th St @TNSLibraries pic.twitter.com/Cz5GxUVaK6

— New School Archives (@TNSarchives) January 25, 2017

Happy #libraryshelfieday! Our #sciencealive25 dino is participating by taking a selfie in front of her favorite bookshelf: our #paleo cookbooks. And since her arms are a little short, she's using a selfie stick from one of our #gopro accessory kits. Clever girl! . . . Join the fun by snapping a #libraryshelfie at your nearest library location!

A photo posted by St Joseph Co Public Library (@sjcpl) on Jan 25, 2017 at 7:41am PST

Slowing it down at the #selahlibrary.

A photo posted by wanderlustwithbooks (@wanderlustwithbooks) on Jan 25, 2017 at 12:35pm PST

Yay #shelfie day! Maggie is a reference librarian at the #faulkcentrallibrary who loves giant art books and #charleyharper Look out for #austinpubliclibrary shelfie poses all day! #librariesofinstagram #libraryshelfie #libraryshelfieday #thatlookssmartonyou #bookstagram #austin #bookshelf #librarianstyle #bibliostyle

A photo posted by Austin Public Library (@austinpubliclibrary) on Jan 25, 2017 at 7:49am PST

It's #libraryshelfie Day apparently. Even though no library in Denmark wants to pay me to librarian I am still a patron. This is my local library which is sadly very messy and with loads of empty shelves. Even in a welfare state the libraries are are being downsized. Everything I wear is old and from @modcloth.

A photo posted by Kat (@missinformation) on Jan 25, 2017 at 7:43am PST

If you sneak up on us, you might just catch us in the act of taking a #Selfie! Or maybe it's just for #LibraryShelfieDay #gailbordenpubliclibrary #gailborden #shelfie #libraryshelfie #libraryfun #funwithbooks #publiclibrary #elginil #librarians #bookish #bookstagram #librariesofinstagram

A photo posted by Gail Borden Public Library (@gailbordenpubliclibrary) on Jan 25, 2017 at 11:52am PST

Ricker Library's founder, Nathan Clifford Ricker, is getting in on #LibraryShelfie Day (thanks to our student assistant Charles), started by @nyplpicturecollection! Take a selfie in the library and tag it with #LibraryShelfie and #RickerLibrary! . #RickerLibrary #librariesofinstagram #library #shelfie #selfie #bookstagram #bookshelfie #bookshelf #ILLINOISlibrary #ILLINOIS #universityofillinois #nathancliffordricker #ricker #architect #drawing #portrait

A photo posted by Ricker Library (@rickerlibraryui) on Jan 25, 2017 at 2:00pm PST