A musician sharing a new single
You just finished mixing a track and you want your followers to hear it the moment it's done. But when you try to upload the MP3 to your band's Facebook Page, Facebook flatly refuses — it only takes video.
You don't want to spend the evening learning video software just to show a still image over a song. You already have the cover art; you just need it to move long enough to count as a video.
So you drop the MP3 here, the cover art appears automatically from the file's tags, you choose a square frame, type the track name, and hit Post to Facebook. A couple of minutes later your single is live on your Page, artwork and all, ready for the first listen and the first share.