I was reading the blogger dashboard info and found this cool new comment gadget you can put at the end of your post. You can hace it save what ever you want so your readers don't feel like they have to type just click on one of three choices that you as the blog owner get to choose. I will try and tell you how to add, hope it works.
Go to Layout
Click on page post edit button
scroll down untill you see something that says reactions
there you can type 3 or more things of your choice or there are pre set ones