REPORT Negoescu_Idiap-RR-19-2010/IDIAP Modeling and Understanding Flickr Communities through Topic-based Analysis Negoescu, Radu-Andrei Gatica-Perez, Daniel EXTERNAL https://publications.idiap.ch/attachments/reports/2009/Negoescu_Idiap-RR-19-2010.pdf PUBLIC Idiap-RR-19-2010 2010 Idiap July 2010