Created site examples for both, but would not pull up for me to copy and past.
I had students use edmodo during the morning ACE program and it seemed to go well. I think the students liked the site because it was like a social network. I like the students are able to exchange ideas, share content and access homework.
I also like wallwishers because the teacher can create and use this tool as exit tickets, warm-ups, and a variety of just different information the teacher may want to get across to the class.