One of the most striking experiences I have had is when I have given my "shape"--the object that holds the dimensions of my body avatar's body--to my friend Shirah, who has put it on herself, adjusted the measurements, and then given it back to me to wear. It takes the idea of the girlfriend makeover to a new level! And shows how what anthropologist Jason Pine, in a fantastic television show available inworld at the Brooklyn Is Watching sim (slurl) calls "self design" can be so very social in SL.
Of course, as I read around, I return to my old standbys, the things that form the very backbone how I make sense out of my experiences in SL: Bartky, Goffman, Pelton, Hall, Benjamin, de Certeau, Foucault to some extent. Heidegger.