WPP yesterday announced the acquisition of Vietnamese digital agency Who Digital. The world’s biggest advertising agency plans to form a joint venture in the country with OgilvyOne, in which it will take a majority stake. Who Digital, which has assets of around £400,000, has clients including Unilever, Megastar, HSBC, Baoviet and Sony Ericsson. The acquisition continues WPP’s ferocious growth in emerging markets. In 2009, WPP’s Ogilvy acquired a majority stake in T&A Communications, a leading PR and events agency in Vietnam. Prior to that it acquired 20 per cent of Smart Media.