You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Mark Zuckerberg Says WhatsApp Worth More Than $19 Billion Messaging Service Not Expected to Make Money for 'Years' , Published on February 25, 2014 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.