International Journal of Geo-Information Article Geo-Tagged Social Media Data-Based Analytical Approach for Perceiving Impacts of Social Events Ruoxin Zhu 1,* , Diao Lin 1 , Michael Jendryke 2,3 , Chenyu Zuo 1, Linfang Ding 1,4 and Liqiu Meng 1 1 Chair of Cartography, Technical University...