Gabbly is a chat room website. The way it works is it puts a chat room on whatever website you are currently visiting. The main room for Gabbly chat for ytmnd would be on the front page. You type it in the browser as http://www.gabbly.com/www.ytmnd.com
It allows chatting for anyone who wants to continue to look at the front page. It also allows ytmnd users to connect without using other software.
Many veteran users believe that Gabbly is a poor man's IRC and choose not to go on it.