Google Plus Introduced Social comment plugin(unofficially). so I just made a small shortcode based plugin for wordpress to test the baby.
BTW, I noticed about this from google plus.
Download from bellow:
Google Plus Comment for Wordpress (1.4 KiB, 871 hits)
Please check here .
For more technical people
'url' => '', // leave empty for current post
'width' => '500',
'js' => 1,
'showarchive' => false,
'showhome' => false
My Test results screenshots: