This first tab is your party (or only yourself if you aren't in a party). You can right-click on your name and choose edit. This allow you to put your flag up on multiple job at the same time, put an away status, a comment, etc.
Last tab on Social list is the search player function. you can search by language/name/job/level range and of course, status (seeking).
So if I'm looking for a tank for a dungeon (in the first and second beta), I would search for a gladiator only, seeking for party, between level 15 and 20. Always found between 2 and 5 player doing various stuff. Checked the comment to make sure that he was looking for a TT party (Tam-Tara) and send a tell.
Shouting for party never worked in FFXI (or almost never), but doing search like this was an habit.. so I just did the same thing...