We had some pretty lively discussions on the VoIP issue, in which I alluded to a paper that was under review. It's now through the peer review process and in press, so is both public and vetted.
This journal (Human Communication Research) does not allow electronic posting for 12 months. If your library has a subscription, you can get the article in a few months. Yet they do allow me to email copies on request. So, if anyone wants a pre-press copy, you can email me at dcwill THE-AT-SIGN uiuc.edu
This paper reports the results of a controlled field experiment in which voice communication was introduced into an existing online community (an online gaming guild within the popular game “World of Warcraft”), comparing a mix of voice and text with text only. Quantitative results suggest increases in liking and trust due to the addition of voice, as well as insulation from unexpected negative impacts of text-only play. The findings are discussed with respect to social capital, cyberbalkanization and the general computer-mediated communication literature, with special attention paid to SIP theory.
For those unfamiliar with a pre-press copy, note that the figures are at the end of the file.