Most of the bloggers are interested in knowing what readers think about blog post. To help bloggers, blogger.com introduced a feature called “Reactions”. Reactions make it easy for authors to get feedback on their content. It’s a simple annotations chosen by authors and given by readers.
With Reactions, readers can easily respond with one click, increasing feedback on posts.
To enable Reactions, log in to your dashboard, go to Layout > Page Elements and click the Edit link in the Blog Posts element to open the blog post configuration tool. Then, check the box next to Reactions, edit your reactions as a comma-separated list, and click Save.
Reactions works with Layouts templates, though if your template is heavily customized, you may have to reset your widget templates for Reactions to appear. If you have a Classic template you will need to switch to Layouts to use Reactions.