A simple plugin that adds a google+ badge for linking to your google+ profile and showing your number of followers.
GplusBadge is a fully customisable google+ badge plugin for wordpress.
It adds a widget to your blog that will display an "Add to Circles" badge for your google+ profile or page. It displays your name, profile image, number and images of people who have added you in their circles.
The plugin uses caching to store your google plus profile data to eliminate checking google+ on every page load. For the caching to work, your web-server needs to be able to write to wp-content. (a lot of plugins require this so it should be fine).
For any issues, please mail to firstname.lastname@example.org
Plugin page : http://www.gplusbadge.skipser.com