Using Wallwisher, I have created a post it discussion board that allows for comments and feedback. I created a wall for lesson plan ideas and brainstorming. It is a very easy to use site which you can login through your google account. Very nice if you don't want to create another account. Here is the link to my new bulletin board http://wallwisher.com/wall/8g8t9hruef. This would be great site for posting student ideas, getting feedback, and discussions.