Thank you for your interest to our products.
Google don’t have free built-in API to make automated posts. You need to obtain a third party library to be able to post to Google+
It’s actually all here in the FAQ:
http://wordpress.org/extend/plugins/social-networks-auto-poster-facebook-twitter-g/faq/
What networks in your auto-poster plugin are free and what are not? Why some networks are not free?
All networks except Google+, Pinterest and LinkedIn Company Pages are available for free.
It really depends on the availability of the free API from the Social Network itself. Facebook, Twitter, Tumblr, LinkedIn and others have a very good and powerful free APIs that could be used for publishing posts. Those networks are free for you. Some networks like Google+ and Pinterest don’t have API or have a read-only API that doesn’t allow to make posts. We had to create our own API libraries for such networks and those libraries are available separately for some fee.
Please let me know if you have any questions.
Ludwig.
NextScripts.com
