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This seems to be a "completely" blank Facebook comment. Facebook does not accept comments consisting solely of newlines or spaces, but accepts a soft hyphen comment. However, unlike a soft hyphen comment, the one in the link doesn't seem to be , and leaves no trace in html (the value <span class="UFICommentBody"></span> is empty). What's the trick behind this? (I've tried inserting a zero-width space or a 1x1 image and it didn't work, but maybe I'm doing it wrong).

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