Two seemingly interesting papers in the latest issue of JASIST:

Lim, Sook. 2009. “How and why do college students use Wikipedia?.” Journal of the American Society for Information Science and Technology 9999:1-14. (link)

and

Jansen, Bernard J., Mimi Zhang, Kate Sobel, and Abdur Chowdury. 2009. “Twitter power: Tweets as electronic word of mouth.” Journal of the American Society for Information Science and Technology 9999:1-20. (link)