First Book has partnered with Houghton Mifflin Harcout Children’s Publishing Division (HMH Kids) to run a social media-based book donation campaign.

The contest was inspired by Chris Van Allburg‘s Caldecott Medal-winning picture bookThe Polar Express. Every time a new user clicks “like” on the HMH Kids’ Polar Express-themed Facebook page, the company will donate one book to First Book (until December 25th). The publisher has agreed to give away up to 25,000 books to the literacy nonprofit.

Here’s more from the release: “The HMH Kids Facebook page features a link to a ‘Polar Express Countdown to Christmas’ online calendar, where families can find a holiday activity for each day, December 1–25, including shareable Polar Express e-cards, recipes for seasonal treats including Polar Chocolate Nougat Caramel Squares, reindeer craft instructions, online games and mazes, and much more. They are encouraged to share holiday playlists and photographs of children reading The Polar Express on the Facebook page.”