Friendliest / Most Social Server?

[Datu]

Hi, everyone. Four of my friends who I used to play FFXI with back in the day will be joining me in FFXIV. Problem is, they can't make new characters in my current server (Gilgamesh) due to the high population. I decided to transfer to a mid population server with them instead and see how it goes.

Now these guys and gals were highly social and community-oriented back in FFXI. I'd like to choose a server that they'll feel at home in. They don't care much about being at the cutting edge of end-game progression. Rather, they cared more for existing in a virtual world. All very old school, I know. With that in mind, can you recommend to me a server that is friendly, chatty and has a vibrant community?

Edit 1: My character profile will say I am now on Siren. I transferred there last night just to check things out. Activity is a bit too low and the few FCs I've tried were completely silent except for one. It's just an early observation. Hope to hear your suggestions.