[jimsmart]

> in this case Facebook specifically mentioned that it didn't turn off the feature though it intended to

What you are describing here is in fact a lack of action, or a lack of change policy (to cause such action). That's not a bug. A bug is unintentional behaviour of some code, not some folk who've said they'll do something, but then don't.

And as for whether the original behaviour is/was a bug is also a point of contention too: that's a lot of willfully bad behaviour that's got chained together somehow to do what it did, then reviewed, signed off, and deployed — that's quite some 'accident' — I write code, and to me this whole thing just smells of a cover-up (by FB calling this a 'bug', when it very much looks to be otherwise).