Could anyone please tell me if there is a character limit on the 'Quick Feedback' utility?
I've tried leaving a few posts that were a few sentences long, and when I click 'submit', I get a message that says I have to wait 30 seconds to make another post and none of my post shows up.
This is normal- there's a standard posting limit to prevent mass-spamming in the forums. If you can't see your post, though, try doing a refresh, then a hard refresh (F5 in Firefox) if that doesn't help. You *should* see your comment, but sometimes it does take a bit of prodding for it to show up.
Like what Strop said, this will HELP prevent it. Spam still happens but not as much. Sometimes I could back to it in a minute and see if my post came up. I don't like refreshing. I'm guessing your new to forums since you have 3 posts.