8
Hello,
I do not use publisher, but I've been watching and I think the best option is to modify the template publisher_item.html.
If you edit the template file contains HTML and Smarty tags to publish the information. You can put the code addthis in the place you want to display. It may be the end, or for instance after the main text ($ item.maintext), ...
I hope that helps you
Sorry for my bad English.
Regards