https://www.reuters.com/article/us-cielo-whatsapp/cielo-shares-plunge-after-brazil-suspends-whatsapp-deal-idUSKBN23V1PU >Shares in Brazilian payments company Cielo SA plunged almost 10% on Wednesday, a day after the nation's central bank and anti-trust regulator effectively blocked the launch of a new system that would allow WhatsApp users to send money via chats.