IRC (Internet-Relay-Chat) is a text-based chat medium. In short, it is the predecessor to instant messaging clients most people use today, and although somewhat antiquated, it is still in use and is a great alternative to proprietary and closed-off chat media. The Gaiapedia has a registered channel on the FreeNode IRC network; for IRC-savvy users, simply join #Gaiapedia on irc.freenode.net.
If you are unfamiliar with IRC, or are behind a firewall preventing you using it, visit irc.wikia.com, choose a name, select #Gaiapedia from the drop-down channel box, and click login to join the Gaiapedia channel. Other channels are available by clicking the advanced options link.