Among those affected were Mark Zuckerberg himself.
The hack occurred on Tuesday 26th September according to BBC
Facebook’s share price dropped as a result.
The hack involved hijacking access tokens used to verify identity.
Many online services depend on the technology to authenticate their users raising yet more concerns about the social networks integrity.
Facebook have announced the flaw has been since patched but given the nature of the hack it’s quite possible that any account linked to the affected users accounts would be vulnerable too, this would include instagram.