Back in vanilla Blizzard experimented with two mechanics to help players form dungeon groups.
The Meeting Stones and a LFG world chat Channel.
The Meeting Stones acted as a crude LFG feature that never saw a lot of use due to its limitations.
But
The LFG channel was simply a world chat Channel where you could advertise for a dungeon group to all questing zones in order to have a larger pool of players to draw from.
Blizzard abandon the lfg channel due to its inability to control gold selling spam, which in the modern game is no longer a problem.
Do you think that blizzard should bring this chat mechanic back to classic?
Keep in mind World is a private channel with one player as a channel moderator. They can ban and kick players from the channel and/or password protect it.
Lookingforgroup is a blizzard channel that is unmoderated making it free from that kind of abuse.