Library Shelfie Day is observed worldwide every fourth Wednesday of January. This holiday encourages book lovers to take photos of their bookshelves and share them on social media using the hashtags #LibraryShelfieDay and #LibraryShelfie. It was launched in 2014 by the New York Public Library to promote the love of libraries and reading. Participants can arrange their books creatively, adding personal items to make their shelfies unique, and ensure good lighting for their photos. Some libraries may host special events for the occasion, and individuals are also encouraged to visit local libraries, borrow books, or participate in book swaps. The day celebrates the joy of sharing book collections and the written word.