I agree with everyone else's comments, and really everyone just needs to read through the posts before they post.  Make sure that whatever you're going to post is either small enough to not skip anyone, or wait until everyone has a chance to see it.  Like lore said, try to use some common sense, and just be aware of each other.  If someone hasn't posted in a bit, especially myself, send a PM and ask if they had an action in mind or if it's ok to keep going.  I won't be offended if you just have Cam step to the side or just tag along if it keeps the story going and I've held it up!