I've noticed that there are lots of folks at AOIR doing work on social network sites. Because this work is happening across numerous fields, I'm trying to keep track of everything that is popping up: http://www.danah.org/SNSResearch.html If you (or someone you know) has a publication on social network sites that is not listed, can you please drop me a note with the citation information and the link to the doc/PDF? I want this to be a resource for other scholars who are doing work here (and for students doing literature reviews). Thanks!! danah