The reason I like this tool is its no fuss attitude - no sign up, no email, no complications. Just type in a question, share the link on your favorite social media site, or grab the embed code and put it on your blog or wiki, like I did here. As people type their answers, they show up in the box. The more times a particular answer is given the larger the word appears (sort of like in a Wordle). It's so easy that my fourth graders love to include them in their blog posts. See an example here and here.
If they have time for me to do a second one I'll demo Wondersaid
Here is another one made by someone else.