WordPress Google+ cross-posting
The Google+ Crossposting plugin imports your public activities on Google Plus into your WordPress blog. It creates a post for each Google+ activity you posted. The plugin regularly checks your public Google+ profile for new activities and posts them automatically to your blog. With it you can keep your blog readers updated on what you're posting on Google+ without them also having to be on Google+.
The WPMU DEV Google+ plugin lets you add a +1 button to your website so that people can tell the world how awesome they think you are. It integrates with Google+ Posts and Pages so that people can easily add you to their G+ Circles.
And now you can post directly from G+ to your WordPress website. The Google+ plugin supports post formats so you can use a hashtag system to decide which post format you want your G+ post to appear as.
It also includes BuddyPress support - post straight from your G+ profile or page to your activity stream. This is a fantastic option for people who run their own BuddyPress community and have a Google+ Page for it. Post to G+ and watch it appear on BuddyPress. Make your life easier, and amaze your community members at the same time.
All you need to do is install and activate the plugin. It's ready to go right away!
Post Format support - map hashtags onto WordPress post formats to create a G+ WordPress tumblog
BuddyPress support - post straight from G+ to your BuddyPress actiivity stream
Other Google+ plugin features:
Allows readers to vote using the cool Google +1 button
Includes a Google +1 widget
Provides ability to choose which posts and pages are included
Includes 4 different button sizes
Show/hide Google +1 counts
Customize position of the button
Shortcodes and styling for further customization
Track your +1s with Analytics integration
Integrate your Google+ Page with WordPress
Integrate with Google+ Pages
Use Google Analytics to track your +1s
Reasons to link Google+ to your WordPress blog
Google drives traffic to your blog, so using Google+ gives better exposure.
Features like hangouts help users interact with each other.
All Google +1′s are considered while ranking your blog post in search results.
It's the best alternative for those who hate Facebook.
Autoposting to Google+ from WordPress
with the free WPGPlus WordPress plugin
Features of the WPGPlus plugin
Posts automatically published to your Google+ profile.
The plugin recognizes links, images, etc.
It generates post excerpts (used in meta box).