High school dating	Web site	Physicist collaborations
Contagion of TB	Books on politics	Freshwater food web
Sexual contacts	Les Miserables	Network art
High school friendship	Interdisciplinary collaborations	IRC channel
The Internet	Yeast proteins	Karate club

References:

• High school dating: Data drawn from Peter S. Bearman, James Moody, and Katherine Stovel, Chains of affection: The structure of adolescent romantic and sexual networks, American Journal of Sociology 110, 44-91 (2004). (The image, however, was made by myself and isn't published anywhere else except on this page.)
• Web site, physicist collaborations, Les Miserables: M. E. J. Newman and M. Girvan, Finding and evaluating community structure in networks, Physical Review E 69, 026113 (2004).
• Contagion of TB, books on politics: Valdis Krebs, www.orgnet.com.
• Interdisciplinary collaborations, karate club: M. Girvan and M. E. J. Newman, Community structure in social and biological networks, Proc. Natl. Acad. Sci. USA 99, 8271-8276 (2002).
• Freshwater food web: Neo Martinez and Richard Williams.
• Sexual contacts: M. E. J. Newman, The structure and function of complex networks, SIAM Review 45, 167-256 (2003).
• Network art: Mark Lombardi, Global Networks, Independent Curators, New York (2003).
• High school friendship: James Moody, Race, school integration, and friendship segregation in America, American Journal of Sociology 107, 679-716 (2001).
• IRC: Paul Mutton, PieSpy project.
• Internet: Hal Burch and Bill Cheswick, Lumeta Corp.
• Yeast proteins: Sergei Maslov and Kim Sneppen, Specificity and stability in topology of protein networks, Science 296, 910-913 (2002).