I was just searching for a way to connect the social accounts to avoid posting manually on twitter, facebook and google+.
The latest jetpack version 2.0 offers exactly this and it works like a charm. Nevertheless google+ is not integrated yet. Hopefully it will be added soon. You only need to connect\allow wordpress.com to interact with your social accounts and once a post is published through your admin panel it is added to your connected plattforms.
edit: found a few plugins which post to google+ but none really convinced me. Problem is the API of Google+ which is not fully available at the moment. see a list here: http://www.wpsquare.com/auto-post-google-plus-wordpress-blog/