Some links for you:

• Creating a cost benefit equation for social media – Kathryn Ashcroft – Paper written by marketeer/PhD student on the back of the event we held at Birmingham City University in July 2010 (tho paper say July 2009)
• Data mash-ups and the future of mapping – JISC (PDF) – "Data mash-ups in education and research are part of an emerging, richer information environment with greater integration of mobile applications, sensor platforms, e-science, mixed reality, and semantic, machine-computable data. This report starts to speculate on forms that these might take, in the context of map-based data."
• The March Of Twitter: Analysis of How And Where Twitter Spread – "Nine months after the creation of the service in March 2006, Twitter only had a few thousand users. A year later there were an estimated 150,000 people using the service. How did Twitter get those vital initial users?"