The advantage seems pretty obvious: Using an app on a phone or tablet means a store manager or associate can see what changes look like as they're made, avoiding embarrassing differences between what appears on a PC's screen and the display. The equally obvious downside: You're trusting your public face to the security of a smartphone. That's a target for pranksters and vandals whose idea of a good time is putting their own message up for your customers to see. The problem is the undercooked state of mobile security.
