Search comments were very useful in FFXI for recruiting players to do various kinds of content. Perhaps they'll be useful here, too.

GUI version
Editing search info: Right click your name in the Social menu. You can edit your search comment, change your LFG status between several types, etc.

Finding people: Use the Player Search tool and set the various fields. De-select all other classes to search for just one class.


Keyboard commands

Setting your status
1) /searchcomment (Your comment goes here; say what you're looking for)
2) /lfp on

Melding materia?: /ltm on
Other commands: /afk on, /busy on.

Searching
/search (forename, surname, status, class, level, company, location, language)

The manual's example: /sea GLA 20-30 "La Noscea"
- returns all Gladiators in La Noscea in that level range.

Alt example: /sea PLD 50 lookingforparty
- find me a tank.

Relic example: /sea ALC 50
- find me someone to meld my relic.