tdehring on "Posting to Google+ results in duplicate title"

Here's a copy from my iPhone using Chrome. It looks the same on my desktop using Chrome (beta channel), Firefox (beta channel), and Safari (final) on OS X 10.8.2.

http://www.timdehring.com/wp-content/uploads/2012/11/screenshot.png

All of my titles in the header are set as follows:

<title><?php wp_title(''); ?></title>