1. When was this study conducted? I remember a story like this from somewhere around 2008. A lot has changed since then. In fact, I recall that during my onboarding at a medium size tech company, it was an explicit part of the company's security training curriculum.

2. I think you may actually have it backwards. I would imagine the engineering group at Twitter (the people who have important credentials) is in some ways more paranoid, or at least more technically savvy and therefore more aware than many of the people at the FBI.