Compose preview button is too close to the publish button
the preview and publish buttons are dangerously close to each other. If the publish button was at equal distance between the “close and discard what I’ve written” and the “publish immediately no matter what” button I might feel much more relaxed about it. :P Same goes for the “oh that doesn’t look right let me edit that once more before posting” button of course.
Maybe we should replace "publish" with "preview", and then once you're in preview mode, there is a publish button? The preview screen might also be a good place to insert a disclaimer about permanence (no deletion possibility).