Enhance the site so that visitors can directly interact with it or among each other, enabling things like user-generated content, comments, voting, chat, or forms for data collection and interaction.
This module allows Flag to be accessed via a web services interface through the Services module. It allows user to Flag content and check if a piece of content is flagged.
This is an API to piece together contib modules in order to build social games on Drupal sites :) Primarily, it will be used to drive user interaction and traffic