Facebook’s smiley sprite is a comic!
I added my interpretation – the left column is the original file, 35 pixels wide and 2164 pixels high. It’s a “css sprite”, a caching/bandwidth-saving technique. The file can be found here, as of now: The URL looks very temporary, it might be gone. You can find it by web-inspecting/debugging a smiley in your Facebook messages/chat and checking the smiley’s element’s background-image CSS property.