Recent Trends and Developments in Social Software : International Conferences on Social Software, BlogTalk 2008, Cork, Ireland, March 3-4, 2008, and BlogTalk 2009, Jeju Island, South Korea, September 15-16, 2009. Revised Selected Papers - John G. Breslin, Thomas N. Burg, Hong-Gee Kim, Tom Raftery, Jan-Hinrik Schmidt ((Lecture Notes in Computer Science))