Using social media for collaborative species identification and occurrence: issues, methods, and tools. - Dong-Po Deng; Tyng-Ruey Chuang; Kwang-Tsao Shao; Guan-Shuo Mai; Te-En Lin; Rob Lemmens; Cheng-Hsin Hsu; Hsu-Hong Lin; Menno-Jan Kraak (GEOCROWD, 2012)