"My Tiny Life: crime and passion in a virtual world" by Julian Dibbell.
...Part memoir and part ethnography, My Tiny Life is about the social life of the online, text-based virtual world LambdaMOO .... in the early '90s. Andrew Leonard, in Salon, called it “the best book yet on the meaning of online life...
This is available as a free (pdf) download from Lulu.com at:
http://www.lulu.com/content/1070691
Thanks to Mr Dibbell and Lulu.
And thanks to the good folks at:
http://onlinebooks.library.upenn.edu/new.html
for their frequently updated list of this and other available free ebooks.