I came across this great link that is new to me but not new for many people. It was created for adults to use for instant feedback at conferences. I have adapted it for use in my classroom. It's called Today's Meet. It's found at www.todaysmeet.com
I created a room with a question for my kids to answer or respond to. Then I put a link up on my webpage for them to access the site. It is a very simple website. You go to the website and create a room. Keep the name simple. It will become your link. Then in your first post, create a question. I like that my kids have to type their name and then their answer to my question and it's a simple click to post their response. And the best part is that it's FREE! You can cut and paste all responses in one highlight to be able to save permanently. You get to choose how long the page and responses stay up anywhere from 2 hours to 1 month. I just love it. Here is what my kids did with the Question: What would you do if you caught a leprechaun?
Check out Today's Meet for an easy way to tap into your students' knowledge. Good Luck!
Also check out a post I wrote 2 years ago for a great spring freebie!