The current research question I have in mind is "what kind of student is more likely to experience social anxiety and why?" and "what impact(s) does a lack of friends and support groups have on students college experiences and life after college?"
Ayres B, Bristow M. Anxiety in College Students. New York: Nova Science Publishers; 2009.
Herring P, O’connor J, Dishman K. Self-esteem Mediates Associations of Physical Activity with Anxiety in College Women. Medicine & Science in Sports & Exercise. 2014;46(10):1990-1998. doi:10.1249/MSS.0000000000000323
Fujii Y. Development of College Life Anxiety Scale(CLAS). International Journal Of Psychology. 2016;51(s1):125-126.
Linden A, Lau-Barraco C, Milletich R. PROTECTIVE BEHAVIORAL STRATEGIES IN A MODEL OF ANXIETY AND COLLEGE STUDENT DRINKING. Alcoholism-Clinical And Experimental Research. 2013;37(s2):92A-92A.
I wonder if "social isolation" is also a useful term, as social anxiety can often lead to that. Chapter 4 of Armstrong and Hamilton's book might be useful. And I frequently see articles online about the dangers of social isolation, which is increasing in this internet age -- see here for example:
https://www.citylab.com/life/2017/04/how-to-break-the-dangerous-cycle-of-loneliness/522180/