Many disciplines study social and information networks. I have always felt that IS researchers are in a somewhat special position to do this. They should know how to collect data, they mostly know graph theory, the can code, they should know stats and (maybe most importantly) they build networks, or software that reveals networks. There is still little network science research going on in IS/BISE, or at least, it could be much more! Maybe this very nice paper by Sundararajan, Provost, Oestreicher-Singer and Aral changes that.
A must read: Information in Digital, Economic and Social Networks
, forthcoming in ISR.