WhatsApp is making a radical update to its app, turning it for the first time into a platform for passively consuming content, similar to the way people scroll through their Facebook or Instagram news feeds — and it’s a move that could finally usher in a money-making system like advertising. WhatsApp’s new Status feature, being rolled out on Monday, will let users share photos, GIFs or videos overlaid with drawings, emojis and a caption that will be visible to selected friends for 24 hours, before disappearing.