I got this plugin installed and successfully make it work for FB, Twitter, and Gplus. Well, 3 buttons shown at the bottom part of each blog post. All are working when user sign up at http://www.url/wp-admin. When user reading an article and at the comment section log in using his/her social FB and Gplus working fine. But twitter is not responding. The twitter button is there but when you click it nothing happens. It seems unusable.
Here is my Science Blog for where plugin was installed.