IBM just used Watson to analyze a person’s writing style to determine their personality. Their online demonstration page is https://watson-pi-demo.mybluemix.net/
The science behind this is based on the fact that “the frequency with which we use certain categories of words can provide clues to personality, thinking style, social connections, and emotional stress. Several researchers found that variations in word usage in writings such as blogs, essays, and tweets can predict aspects of personality (Fast & Funder, 2008; Gill et al., 2009; Golbeck et al., 2011; Hirsh & Peterson, 2009; and Yarkoni, 2010).”
With the analysis provided, companies can theoretically gain a further insight into potential candidates’ personalities and decide whether they are a fit for the company.