I found this website that looks very cool.It is called
Answer Garden You post a question and people have the chance to type in a short 2 or 3 word answer. What a great way to start a conversation with students! You will see the answers appear below you question and if you put your cursor on an answer you will see how many times that was entered. The site has lots of examples, an Answer Garden is very easy to create and embeds easily into your blog or wiki! Give it a try in the example below.

How do you feel about wikis... at AnswerGarden.ch.