Dear Beatrice I found some articles which I hope will be useful.
Ala-Mukta, K. Learning in Informal Online Networks and Communities. JRC Scientific and Technical Reports. 1-77. ftp://ftp.jrc.es/pub/EURdoc/EURdoc/JRC56310.pdf
Boyd, D.M. & Ellison,N.B. (2008). Social Network Sites: Definition, History and Scholarship. Journal of Computer Medicated Communication. 13, 210-230. http://onlinelibrary.wiley.com/doi/10.1111/j.1083-6101.2007.00393.x/epdf
Dabbagh, N &Kitsantas, A. (2012). Personal Learning Environments, social media, and self-regulated learning: A natural formula for connecting formal and informal learning. Internet and Higher Education. http://anitacrawley.net/Articles/DabbaughPLE.pdf
Hudley, E. (2012). Social media as an Educational Tool in University Level Geography. Teaching Innovations Project. Vol.2, Iss.1, Article 5. : http://ir.lib.uwo.ca/tips/vol2/iss1/5
McLoughlin, C. & Lee, M.J.W. (2007). Social software and participatory learning: Pedagogical choices with technology affordances in the Web. 2.0 era. Proceedings ascilite Singapore. 664-675. http://www.dlc-ubc.ca/wordpress_dlc_mu/educ500/files/2011/07/mcloughlin.pdf
Minocha, Shailey (2009). A case study-based investigation of students’ experiences with social software tools. New Review of Hypermedia and Multimedia, 15(3), 245–265.
Pătruţ, B, Pătruţ, A. & Cmeciu, C. Social Media and the New Academic Environment: Pedagogical Challenges. Information Science Reference. https://www.researchgate.net/profile/Luciana_Duranti/publication/262894540_eLearning_records_Are_there_any_to_manage_If_so_how/links/5494b82c0cf2ec1337581b48.pdf
Williams. R.W. (2012). Digital Immigrant Teacher Perceptions of Social Media as it Influences the Affective and Cognitive Development of Students: A Phenomenological Study. PhD Dissertation. Liberty University, USA. http://digitalcommons.liberty.edu/cgi/viewcontent.cgi?article=1613&context=doctoral
Chapter eLearning records: Are there any to manage? If so, how?