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Would anyone know of any active communities for sysadmins on IRC or otherwise? Or a directory to find such channels?

Never really been one for being involved in online communities but being a one man team at work has got me looking for people of similar interests.

I've noticed a #reddit-sysadmin , likely there's a ##sysadmin too and probably others. The double # indicates a topic https://freenode.net/kb/answer/namespaces