[Air-l] Friendship/Kinship Articles

Does anyone know of any articles on friendship particularly (or kinship also). I am 'doing ethnography' in an online community (from a Social Anthropological viewpoint) and my data is driving me to look at friendship as perhaps a more flexible bond than kinship. In some cases friendship seems to be the precursor to the adoption of familial roles' as in ..."she's my cybermom". Strong friendship ties appear to be a major part of the social relations that are being negotiated in this particular online community. I didn't want to lose myself in trawling through all the kinship literature. thanks a lot Denise