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It would be nice if I could remove songs from playlists that I've accidentally given thumbs up to. It would be especially cool if I could remove those songs from all playlists that they might be on.
Since this technically isn't a feature, I moved your post over to our Ideas Board. Unfortunately, for now, the only way to remove an accidental thumbed up track from a playlist is to manually go in and remove.
The status of your idea is now Open Ideas. Hope to see you around community more.