My wife is Chinese but has lived in the UK since 2001 and is a British citizen. In the early days she talked about us moving to China some day, but now feels much more at home here. She absolutely loves WeChat and uses it all the time. She uses it to keep in touch with old friends in China and new Chinese friends in the UK. It also keeps her connected to contemporary Chinese culture. So even outside China, WhatsApp's reach through the broader Chinese community is almost total.