After publication of this article [1], the authors reported that in the Funding section “FS acknowledges support from the IMT School for Advanced Studies PAI project Toffee and EU project SoBigData-PlusPlus, nr. 871042.” should have been “FS acknowledges support from the IMT School for Advanced Studies PAI project Toffee. This work is supported by the European Union – Horizon 2020 Program under the scheme ‘INFRAIA-01-2018-2019 – Integrating Activities for Advanced Communities’, Grant Agreement n.871042, ‘SoBigData++: European Integrated Infrastructure for Social Mining and Big Data Analytics’ (www.sobigdata.eu).”