Summary List Placement The start of a typical workday for Raymond St. John is a lesson in the appeal of messaging apps. St. John is the founder and CEO of Rain Unlimited Global, a boutique private-equity firm based in New York City that invests in natural-resources companies in Uganda, Kenya, Tanzania, and Ghana. Then it sells commodities including gold and coffee to buyers around the world. "At 6 a.m., I'm using WhatsApp to communicate with Serbia. Shortly thereafter, I'm using Signal," he told Business Insider in an interview. "I was using Telegram for Africa. And then China, obviously, prefers WeChat.