@conference {3721, title = {Preparing in Isolation?! Sharing \& Tagging Educational Resources Among Teachers}, booktitle = {Association for Educational Communications and Technology (AECT)}, year = {2014}, address = {Jacksonville, USA}, keywords = {Network of Practice, Social Bookmarking, Social Network Analysis, Teacher Education}, author = {Martin Rehm and Tobias H{\"o}lterhof and Heinen, Richard and Scharnberg, Gianna and Michael Kerres} }