As it stands now in the game, you have to advertise in chat about your group or wanting a group for specific game content. This is very inefficient and unnecessary at this point in my opinion, because it results in chat being spammed in populated zones, and just in general clutters the chat if any conversation was being made. The most egregious example is Alik'r Desert with the massive amount of people Dolmen farming and just about everyone spamming the chat with XYZ when they enter the zone.
My suggestion is that in the Group Tab, a new section is made where you can create a public group with a group name or category (to specify what the group is for), possibly some limitations to joining the group (areas such as Craglorn, where a majority of players are at a high Champion and are doing difficult zone content, or advertising that they want to form a group for dungeon content with other high Champion players), and an adjustable group size limit.
This would make it infinitely better and easier to form groups for general content like Dolmens, Public Dungeons, Zone Completion or Questing, etc. And would make really any sort of group forming more organized and concise.