We communicate on mailing lists divided by topics and target groups. Feel free to subscribe to any of these lists.
The main list for user questions:
A dedicated mailing list where people can chime in and collect and discuss QGIS related UX (User Experience) / usability issues.
The main list for questions about the development of QGIS core or plugins
List for managing the community: websites, documentation etc
List for translators of either the website, or the QGIS itself