About the Authors

Peter Burger

Contributed equally to this work with: Peter Burger, Soeradj Kanhai, Suzan Verberne

Roles Conceptualization, Supervision, Writing – original draft

Affiliation Department of Journalism and New Media, Leiden University Centre of Linguistics (LUCL), Leiden University, Leiden, the Netherlands

Soeradj Kanhai

Contributed equally to this work with: Peter Burger, Soeradj Kanhai, Suzan Verberne

Roles Data curation, Formal analysis, Methodology, Resources, Software, Visualization, Writing – original draft

Affiliation Leiden Institute of Advanced Computer Science (LIACS), Leiden University, Leiden, the Netherlands

Alexander Pleijter

Roles Conceptualization, Writing – review & editing

Affiliation Department of Journalism and New Media, Leiden University Centre of Linguistics (LUCL), Leiden University, Leiden, the Netherlands

Suzan Verberne

Contributed equally to this work with: Peter Burger, Soeradj Kanhai, Suzan Verberne

Roles Methodology, Supervision, Visualization, Writing – original draft, Writing – review & editing

s.verberne@liacs.leidenuniv.nl

Affiliation Leiden Institute of Advanced Computer Science (LIACS), Leiden University, Leiden, the Netherlands

Competing Interests

Two authors, PB and AP, received payments from Facebook for their services as a third-party fact-checkers. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.