App for business users lets you share sensitive documents -- then they disappear

Sharing secrets is nothing new in the business world, but a young startup is hoping to change how professionals do it.Emails and most other digital communications have a nasty habit of lingering, as the Sony hacks recently proved, leaving little besides face-to-face conversations as an untraceable alternative. Confide, however, has created a Snapchat-style app for the enterprise world, and the technology just got a key update.The latest version of the company’s namesake app, released on Wed