[SeT]

http://www.wowwiki.com/Looking_For_Group

Looking For Group or LFG chat channel is often used by a player character when not in a group who wants to join a group, usually to pursue a quest. At time of writing, this is deactivated by default. To join this channel, you have to actively be LFG/LFM.

The LFG channel went global in patch 1.11. The first Tuesday night it appeared, there was a flood of chatter which rendered it completely ineffective. This subsided very quickly in the following week or so, but it recurs on at least some servers, where people chat about unrelated things.
Soon after this, GMs started to remove authority to speak from those who abused the channel. If this happened, it would last for some time, after which you would regain ability to use the channel again. Still, there were times when the GMs would not kick those who consistently chatted or spammed some guild-recruitment message, even though there is a guild-recruitment channel.