I was checking our communication site and I came across this other option to work with walls. I've already used wallwisher but I believe this one ( stixy ) offers more options and more space for students to come and participate. It can be used in various ways depending on the group and the teacher's creativity. Just to try on and see if it works I prepared this wall to use with my Upper level. The grammar topic is 2nd conditional. I will ask them to come to the wall and tell me what they would do in the 3 situations suggested on the wall. I'll ask them to do at home but if they don't I'll give it in class.
http://www.stixy.com/guest/86755