After reviewing your plugin, I believe it violates the TOS of WordPress plugin repository.
The issue is that this plugin adds plugin developer's link without user's content.
Rule listed here: http://wordpress.org/extend/plugins/about/
Under few restrictions -
4. The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission.
It adds a URL to the plugin devs site without user's permission in a deceptive manner.
Once you add the widget in your sidebar, it shows Follow me on Google+
Below is the user's picture then it says Username ... Add to Circles
in 491 people's circles with a + sign next to it.
So you would think that this plus sign might let you add this person in your circle... but once you click on the plus sign it shows plugin author's link.....