As a current engineer at Facebook, I would be really surprised to read anyone claiming we don't "take it seriously." It absorbs an enormous amount of engineering effort, thought around new products, and even cap ex: computing visibility for objects whose permissions are "friends of friends", for example, is computationally expensive.
What of the claims that information control is extremely loose internally - i.e., an employee can easily gain access to users' private data without sufficient gating, and that accesses such as these are not easily auditable?
When Zuckerberg is running around saying that wanting to share things with only certain people shows a "lack of integrity" (http://eparnell.net/?p=169), it's not an unreasonable preconception.
