I downloaded the plugin because I read it was compatible with G+ for free. Unfortunately you have to pay at least 49$
On the other hand it is not working with Facebook and Twitter due to recent changes of their policies.
I could not make it work at all.
For Facebook and Twitter you can use IFTT (https://ifttt.com/) it also has many bugs but it works fairly good with Facebook and Twitter, it is free, and you don't need to install anything on your wordpress.