AddToAny is a universal sharing platform that can be integrated into a website by use of a web widget or plugin.
Drupal Multisite enables separate, independent sites to be served from a single codebase.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Open Graph is a protocol that is used to integrate any web page into the social graph.