How to insert social share buttons in drupal 7 using Bootstrap Social Sharing Buttons?
This module implements networks by harcoding in the module's code. Because it is not much clean way how to implement modules for this use-case and this module is not widely used, I recommend you to use somethink different.

If you dont't want to include third party scripts to your site (they can spy your users and slows down page) you can use this module: https://www.drupal.org/project/service_links It is also widely used, so should be better developed and maintained in the future.