There are several spaces where you can join in the discussions around the MQTT community, and we encourage you to get involved!
Mailing lists / discussions
The primary conversations happen via a Google group (subscribe via mailing list, or use it as an online discussion group via a web interface). Anyone can make a request to join, and the group is moderated to ensure that only relevant content is posted.
|Subscribe to MQ Telemetry Transport|
|Visit this group|
News / social
News, announcements, and the feed from the mqtt.org blog is shared on Twitter. The Twitter ID is @mqttorg and the hashtag for related conversations is #mqtt
There is an IRC channel on the freenode network – #mqtt.
If your IRC client is configured as the irc:// URL handler you can click on this link irc://irc.freenode.net/mqtt
Alternatively, if you do not have an IRC client, you can use the webchat interface.
Some developers post questions on Q&A sites such as StackOverflow
There is an informal / unofficial / low traffic LinkedIn Group.
Of course, individual MQTT-related projects may also have their own mailing lists, bug trackers and discussion forums, so feel free to discuss implementation-specific issues in the appropriate places!