Erratum to: Touristic site attractiveness seen through Twitter Aleix Bassolas, Maxime Lenormand, Antònia Tugores, Bruno Gonçalves and José J Ramasco EPJ Data Sci., 5 1 (2016) 16 Published online: 13 April 2016 DOI: 10.1140/epjds/s13688-016-0077-1