Okay, I don't want to sound like a jerk here, but the edit button is there for a reason. My general rule is that if no one has posted in the time that you would have made a new one (around five minutes), it's safe to assume that when they refresh they'll see any edit you made. This is particularly true if you hover over their name and see "Reading 1 minute ago" or something. That generally means they have nothing to post but are paying attention, so an edit would be more appropriate.If you think someone may have missed something that you would have liked them to see, reposting is fine. I'm only really bringing this up because many of the posts are less than ten minutes apart. In my opinion it's fine to double post if an hour or so passes, but the edit button is getting a little lonely without your patronage.