Wikipedia page about this book: https://en.wikipedia.org/wiki/Eastern_Standard_Tribe

Release date is 2005-11-20

"Eastern Standard Tribe" by Cory Doctorow is a science fiction novel published in 2004. In a future where people organize into online "tribes" based on shared time zones rather than physical location, Art Berry works as a double-agent consultant in London. After a chance encounter with Linda leads to a revolutionary idea for peer-to-peer music sharing, Art becomes entangled in betrayal and conspiracy. Now trapped in an insane asylum, he must piece together how his girlfriend and colleague orchestrated his downfall. (This is an automatically generated summary.)

Original publication data not identified