Invisibility and Iterative Attacks

In regards to the invisibility argument that came up on Sunday, here are quotes from James Jacobs: 

"Nope; even two-weapon fighting doesn't let you sneak in an extra sneak attack. Essentially, once you make your first attack, the foe knows you're there and is no longer flat-footed after that. It takes things like greater invisibility that prevent a foe from noticing you even after you attack to get in a full round of sneak attacks."

http://paizo.com/threads/rzs2jxuq?How-Many-Sneak-Attacks-in-a-FullAttack-Action#6

and this, emphasis mine: 

"You get to add sneak attack damage each time the target is unaware of you and is flat footed or whatever. Normally, that means only the first attack sneak attacks"

http://paizo.com/threads/rzs2l7ns&page=456?Ask-James-Jacobs-ALL-your-Questions-Here#22758