News Facebook finds more plain-text passwords

Now i have the image of Facebook employees all sneaking around wearing balaclavas...We be gangsters, see, we wear masks so we don't see dem passwords, see.

FYI: is the first sentence meant to read "admitting that rather than 'tens of thousands of Instagram Facebook users' the gaffe affected 'millions of Instagram users."?

 

"finds more plain-text passwords"

FB employee A: "Sorry to bother you but the coffee machine is leaking"
FB employee B: "You might have confused me for someone else, I work in IT not building maintenance"
FB employee A: "It isn't leaking water, it is leaking plain-text passwords"
FB employee B: "Just my luck, first the toilet, now the coffee machine"

Seriously, how the f*** does a company lose track of the processes used to store user passwords so hard that it can "discover" later that millions of passwords where stored in plain-text?