Repeatedly I have been talking to people about Stumbleupon, Zite and My Mercedes as examples of personalisation.
There is evidence to suggest value in “vicarious interaction,” in which non-active participants gain from observing and empathizing with active participants (Sutton, 2001; Fulford and Zhang, 1993), also Cox (2006)
For learning on the periphery you need John Seely- Brown, who gave a keynote speech on the subject here at The OU in October 2007.
Cox, R. (2006) Vicarious Learning and Case-based Teaching of Clinical Reasoning Skills (2004–2006) [online], http://www.esrcsocietytoday.ac.uk/ esrcinfocentre/ viewawardpage.aspx?awardnumber=RES-139-25-0127 [(last accessed 10 March 2011).
Fulford, C. P., and Zhang, S. (1993). Perceptions of Interaction: The critical predictor in distance education. American Journal of Distance Education, 7(3), 8 – 21.
Sutton, L. (2001). The principles of vicarious interaction in computer-mediated communications. Journal of Interactive Educational Communications, 7(3), 223 – 242. Retrieved July 15, 2003 from: http://www.eas.asu.edu/elearn/research/suttonnew.pdf