[nukeop]

I can't imagine the opposite could ever happen, be it small companies or big ones - there is not a single company on Earth that has the time to audit every line of every piece of software they run. Especially if that software is proprietary and source isn't even available.

[get]

It's not about auditing every line of code. It's about a chain of trust.

I can not imagine that the security of Facebooks servers is at the mercy of a chain of anonymous coders.