One Per Tribe. No more. No less. By definition, a chief is not a chief without a tribe, and a tribe is not a tribe without a chief. If you have six divisions — Operations, Supply Chain, IT, Finance, Marketing, and HR — you have seven tribes (one per division and the tribe of chiefs) and seven chiefs — COO, CSCO, CTO, CFO, CMO, CRO and CEO. You don’t have a Chief Blogging Officer. You don’t have a Chief Apology Officer. And you definitely don’t have a Chief Twitter Officer. If you do, you’re screwed up and not even supply chain will save you.
Sorry. But that’s just the way it is.