Wall Street Journal: Snapchat, one of the most highly valued private tech startups, finally hired someone to run its finances. Drew Vollero, a former finance executive at toy maker Mattel, is joining Snapchat as vice president of finance and acting chief financial officer. Vollero will report to Imran Khan, a former technology banker hired last year to oversee strategy at the mobile messaging company. Snapchat is taking steps to turn its free app for disappearing messages, used by about 100 million people, into a business.