Social Sites - Purpose and Examples
The goal of Social and Community sites is to become a gathering place for, and provide features for a community of users to share information and interact with one another based on specific interests.
Until I get to adding more to this section you can start with this (rather dated, and not very current) comparison of Social and Community Distributions:
- https://www.drupal.org/node/1291730 - Though very incomplete, it will give you some idea of the types of features considered for this purpose.
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Just getting started on this... message me (https://www.drupal.org/user/18028/contact) if you'd like to contribute to this section...