Originally Posted by tecweston
It's hidden but there's a way to do it with Nook books. Within the book, tap the screen and then tap "More." Then tap "Share," then "Post Reading Status." You don't have to actually post anything to Facebook or Twitter, but it will have a preview of your post that says "I am through xx% of the book..."
For side-loaded books, just do it the whole fashioned way:
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