WhatsApp now has disappearing messages, but there's a catch

Facebook's WhatsApp has added a much-needed privacy feature: disappearing messages. But it seems that the company has a slightly odd idea of what this feature is for.  In a blog post Thursday, WhatsApp introduced the new feature, saying the company's goal is to "make conversations on WhatsApp feel as close to in-person as possible, which means they shouldn't have to stick around forever."  Now, users can turn the feature on for one-to-one chats, and new messages sent to a chat will disappear a...