About the Authors

Petra Kralj Novak

Petra.Kralj.Novak@ijs.si (PKN); Igor.Mozetic@ijs.si (IM)

Affiliation Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

Jasmina Smailović

Affiliation Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

Borut Sluban

Affiliation Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

Igor Mozetič

Petra.Kralj.Novak@ijs.si (PKN); Igor.Mozetic@ijs.si (IM)

Affiliation Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

Competing Interests

The authors have the following interests: The sentiment annotations were supported by the Goldfinch platform, provided by Sowa Labs (http://www.sowalabs.com) for free. Most of the tweets (except English) were collected during a joint project with Gama System (http://www.gama-system.si), using their PerceptionAnalytics platform (http://www.perceptionanalytics.net). There are no patents, products in development or marketed products to declare. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: PKN JS BS IM. Performed the experiments: PKN JS BS. Analyzed the data: PKN JS BS IM. Wrote the paper: IM BS JS PKN.