Haha, I haven't booted it up again past the first five or so minutes. I had no idea what was even happening.
Quick Toro Friend Dungeon FAQ:
1) Make Friends. Not sure if you can just directly add PSN friends and have them pop-up in game, but you can also find friends via Twitter/Facebook syncing, or random people that show up in the lobby. Up to 10 invites per day allowed in the Lobby.
2) Accepted Friends or Pending Invite Friends will show up in your garden afterwards and float around. Accepted Friends can be assigned 'Work' at corners of the screen. You get a few options for faster completion times based on Job or Level of the person you're assigning the work to. After it's completed you gain MP and EXP. You can also 'Hustle' by interacting with a person who's sent you to work, which cuts the time it takes for it to complete for them.
3) MP (or real money) can be spent on Cards or Outfits in the Equipment store. Cards are your stat info people see when they examine you as well as your ATK (weapon) in the Dungeon. Outfits show up on your avatar and are your DEF (armor) in the Dungeon. Each has individual stats varying based on price. Silver-Background Items are bought with MP, Gold-Background Items must be bought with Coins (purchased for roughly $5=1000C). Not everything is shown on the front page, use the filters on the bottom of the screen.
4) Stat-Gains. You gain +1 Maximum HP for various acts such as patting someone on the head (when you read a tweet), getting pat on the head (they read your tweet), Hustling, etc, up to 20 Max HP per day. You also gain a permanent ATK/DEF boost every time you buy an Outfit or Card, +1 each time (I believe).
5) Dungeons involve bringing two friends to fight enemies, although I have to wait until tomorrow to try it. Each friend needs a 24 hour break every time you bring them down, and you can unlock new outfits/cards by progressing through them.
*) You can actually make your in-game avatar your Facebook or Twitter avatar rather than being limited to your PSN selection!