"Confessions of Leftover Men" was a research carried out by matchmaking Chinese website Shiji Jiayuan that attempted to find out what causes there to be so many shengnans in China. It was published in 2013.
It was an online survey that found that "of 56.013 single men born between the 1970s and 1980s. Some of their findings: the rate of single men is highest in Guangxi with a 34.9% percentage; 49% of them do not own a house or car; 60% of them admit to being a so-called ‘zhainan’ (a ‘geek’ with low social interaction) (China Daily 2013, Sina 2013). This account of China’s single men poses a stark contrast to that of China’s unmarried woman, the ‘shengnü’ (剩女), who has been profiled as being successful, sexy and single. The new report on single men coins many questions: why is it so hard for these Chinese men to find women? What is the main reason for their unmarried status? And why is their general profile so different from their female ‘leftover’ counterparts?" (whatsonweibo)