THe front page of this module needs an update. It claims things that aren't true about this module. For example, this module doesn't allow for a new message category type.
I had to read through the issue queue and do some random searches and module exploration just to figure out what is going on with this module and how to use it.
Closed: outdated
2.3
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.