How to add a Google+ badge to your website
Anyone with a Google+ profile can now include one of two types of badges linking to their account. Follow these simple steps to get yours.
First, visit your Google+ page, and copy your account number (it’s the long string of numbers at the end of the URL). To see your account number, just click on your profile picture. Doing this will populate the numeric values associated with your Google+ account.
Open a new tab or window, and visit the Google Developers site to build your profile badge.
Once you pop in your account number, you’ll have two choices: a simple icon linking to your Google+ profile, or a more interactive badge, which also includes your name and the ability for a user to “Add to circles” right from your website.
Then, simply grab the two pieces of code (one piece shows authorship and the second displays the badge or icon) and add to your website or blog.
Once you’ve done this, verify your markup by putting in your URL on Google’s Rich Snippets Testing Tool. Don’t forget to circle me up on Google+!