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I like the backstory part of it too. It puts a little meat on the bones of the post, and shows (where applicable) that the words have some real meaning to the author. Thanks for giving the OK on it; I probably stole the idea from you. :)

I do agree about the relevance thing. There is only so much you can convey with 50 words, and when there’s a story behind the story, I think it’s great to add that. One of the #fiftywords stories where I added the backstory was one about the assassination of Lincoln. Another, if I recall, was one I wrote about the Unabomber.