Onlinebefragung von 8382 NutzerInnen sozialer Netzwerkplattformen zwischen 12 und 19 Jahren und qualitative Interviews mit 31 Jugendlichen desselben Alters. Überblick gibts hier:
http://www.uni-leipzig.de/~mepaed/medienkonvergenz-monitoring/ergebnisse/memo-son10-medienkonvergenz-monitoring-soziale-online-netzwer
The recently released ECAR Study of Undergraduate Students and Information Technology gives some excellent insights into trends in college students' technology ownership, perceptions, skills, and habits.
The three biggest usage spikes tend to occur on weekdays at 11:00 a.m., 3:00 p.m. and 8:00 p.m. ET. The biggest spike occurs at 3:00 p.m. ET on weekdays. Weekday usage is pretty steady, however Wednesday at 3:00 pm ET is consistently the busiest period. Fans are less active on Sunday compared to all other days of the week.
N. Agarwal, H. Liu, L. Tang, and P. Yu. WSDM '08: Proceedings of the international conference on Web search and web data mining, page 207-218. New York, NY, USA, ACM, (2008)