What do the various message icons, such as the dog-eared page, question mark, etc, found in the left margin, mean? And who puts them there? The poster? If so, why? Is he/she trying to hype his/her post--like, "Hey, this is hot stuff!" or is he/she tellingl readers to avoid reading that post? I understand the emoticons, but dog-eared pages??? Please 'splain.