The reason security researches follow "responsible disclosure" is because publicizing the flaw or existence of the flaw could allow innocent customers to be hac

The reason security researches follow "responsible disclosure" is because publicizing the flaw or existence of the flaw could allow innocent customers to be hacked and suffer security breaches. However in this case, Facebook users can't be affected. We know the root cause of this 'breech' a dodgy Facebook app. If the original blog post actually contained the details of the users affected, it would be a different matter.