At CeBIT 2009 Sydney, Australia's Enterprise conference, Geoff McQueen had the pleasure of delivering a presentation which highlighted the main challenge affecting the success of enterprise software implementations: realising effective user adoption. Looking around at who does user adoption well, and who can teach Enterprise a thing or two, the story of Facebook - with its defined features, platform nature, security model and more - comes to the top of your mind. This presentation looks at what enterprise software - and the people who purchase, implement and manage it - can learn from the runaway success of Facebook as a user engagement case study.