Whatsapp in the board room

I have now heard of two organisations, large ones, in different parts of the world, involved in serious business, whose senior execs are using Whatsapp to communicate with each other. And IT thought that Facebook was a challenge!

Who needs over engineered, overpriced social platforms when people are starting to do it for themselves using consumer platforms? I can hear the cries about security and professional level tools already - but isn't it too late? Haven't the trojan mice already bolted? Sure it's just like texting at one level, sure the amount you can say in these apps is limited, but if the senior folks are already using consumer technology of this type it will be fascinating to see where this takes us.