"Using data on the Facebook activity of a cohort of college students over 4 years, we find that students who share certain tastes in music and in movies, but not in books, are significantly likely to befriend one another. Meanwhile, we find little evidence for the diffusion of tastes among Facebook friends—except for tastes in classical/jazz music."

Lewis et al. (2011) in PNAS

I just read the abstract, but from this I conclude that college students in general don’t read/don’t put much stock in reading.  Also, people who listen to classical and jazz are socialists.