Interface has an on-campus IRC server (irc.interface.org.nz or just interface.org.nz). It has a population of around 30 people at any one time, with a number of channels, including social discussion channels.
There is a pastebin: http://paste.interface.org.nz/
Note: As the Interface servers are connected to the Victoria University network, users of the Interface IRC server are required to agree to the VUW Information Systems Statute. This includes the Student Conduct Statute, in particular section 4.2 (Definition of Prohibited Conduct), which prohibits discrimination, harassment and academic misconduct. For more information, please read the Statutes.