If you don’t know what a +1 means, think of it as a public stamp of approval from your readers. As soon as someone clicks on the +1 button next to your blog, they’ll also have the option to share it with their friends, contacts, or the rest of the web.
+1s from your readers will appear to people in their circles whenever your blog shows up in Google search results.
Here’s an example:
The Google+ badge gadget allows you to connect your blog to your personal profile or your Google+ page on Google+. Adding the badge to your blog helps you connect with friends, fans, and customers. It enables your readers to add you, or your blog to their circles and follow your blog posts on Google+.
How To Add Google+ Badge and +1 Button To Blogger
To add these gadgets to your blog, select “Add a Gadget” from the “Layout” tab of Blogger, and select them from the list of gadgets under “Basics“. You’ll need to copy your Google+ ID (personal or Page) to configure the brand badge gadget for your blog.
Add the +1 and Google+ brand badge gadgets to your blog today to grow and engage your audience.