Meghan Markle's private WhatsApp message was meant to be the kind of polite, polished introduction any new parent might send: "Hi, moms, thanks for the warm welcome. So happy to be part of this community." Instead, that message has now become part of a humiliating public discussion, after her number was reportedly exposed in an Oxford parents' chat. What looked friendly and harmless has been recast as the opening scene of a much larger security story.