Social media in China have begun buzzing about Chinese twin sisters who recently graduated from one of the most prestigious schools in the United States.Sun Yumeng and Sun Yutong have completed their graduate degrees in Education from Harvard University, just a year after finishing their undergraduate studies at Fudan University in Shanghai.The 23-year-old sisters have become an internet sensation, in part because of their beauty, but also due to their scholastic abilities.Pictures of the pair, who hail from Nanjing, capital of East China's Jiangsu province, show them to be virtually inseparable during their time together at Harvard. [Photo from Sina Weibo]