Twitter -- allow people to edit their tweets and put a check on the levenshtein distance between the edit and the original tweet and make it remain in some value range so that spelling mistakes can be fixed but tweets can't be radically changed.
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I suspect that many 'conditionally edit tweet' PRDs at twitter.com have died on the hill of Policy and Legal.
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(Meaning it is always legal's fault) -- not that it is legal legal. See? This is why I need edits.
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The last best effort suggested "edit is approved iff the original and the post-edit tweet's embeddings on a certain vintage of Word2Vec have cosine distance no greater than 0.02" before they got laughed out of the room.
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