Looking for references about Twitter and Co?

Finally, I got directed to a nice list of references about Twitter and Microblogging, very useful for future papers:

• Bibliography of Research on Twitter & Microblogging
• Microblogging References
• Bellotti, V., Begole, B., Chi, E. H., Ducheneaut, N., Fang, J., Isaacs, E., King, T., Newman, M. W., Partridge, K., Price, B., Rasmussen, P., Roberts, M., Schiano, D. J., and Walendowski, A. 2008. Activity-based serendipitous recommendations with the Magitti mobile leisure guide. In Proceeding of the Twenty-Sixth Annual SIGCHI Conference on Human Factors in Computing Systems (Florence, Italy, April 05 - 10, 2008). CHI '08
• Chen, J.; Nairn, R.; Nelson, L.; Chi, E. H. Short and tweet: experiments on recommending content from information streams. Accepted for CHI 2010. http://zerozero88.com/