I just commented on the juice cleanse conclusions article, and got a message saying my comment was being held for approval. This has happened to me a couple of times before, but usually when I include a link (or several links), which makes sense for spam filtering. But this comment didn't have any links...though I guess it might be a bit long...?

Are there certain criteria (which could be avoided by SE users who want to participate in discussions immediately) for what will set off the comment filter?