##udacity-cs255 at Freenode (irc.freenode.net)
This an unofficial channel, don't forget double hash (##)
Internet Relay Chat (IRC) is a protocol for real-time Internet text messaging (chat) or synchronous conferencing. It is mainly designed for group communication in discussion forums, called channels, but also allows one-to-one communication via private message as well as chat and data transfer, including file sharing.
Try the web gateway.
Try one of the IRC clients for a better experience.