Promotion your pr in google +1 with the google plus one bottom plugin. With google plus one bottom, your users can promote your content by sharing google +1.
This plugin now is only provide google +1 in single post page, the more will be later. With the google’s css, has some interface problems in the plugin admin interface, but it only in the admin interface.
RoadMap:
1:provide a shortcode to wordpress. 2:fix the css(now is use the google’s). 3:More custom in the front, weight, achive, and so on.