Ok, sometimes things break. We try to fix them as soon as possible, but sometimes we might not be aware of a problem. A great way of making us aware is to head to this page and file a report. Be as descriptive as possible and include your OS and browser details.
Of course there are times when you think something is wonky, but aren't sure if it's really a bug. The #whitenoise and #broken tags are great in those cases. Odds are that someone will jump to tell you that something's not a bug or we'll realize that there's an issue of sorts. Recently a few commenting bugs have been noticed and diagnosed thanks to some #whitenoise comments, so the method does work.