@conference{EURECOM+3881, author = {Sha, Xiaolan and Quercia, Daniele and Dell\&\#039 and Amico, Matteo and Michiardi, Pietro}, title = {Trend makers and trend spotters in a mobile application}, booktitle = {CSCW 2013, 16th ACM Conference on Computer Supported Cooperative Work and Social Computing, February 23-27, 2013, San Antonio, Texas, USA}, year = {2013}, editor = {ACM}, address = {San Antonio}, note = {© ACM, 2013. This is the author\&\#039;s version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in CSCW 2013, 16th ACM Conference on Computer Supported Cooperative Work and Social Computing, February 23-27, 2013, San Antonio, Texas, USA http://dx.doi.org/10.1145/2441776.2441930}, }