General discussion of data quality challenges in social media metrics: Extensive comparison of four major altmetric data aggregators

• Zohreh Zahedi ,

  Contributed equally to this work with: Zohreh Zahedi, Rodrigo Costas

  Roles Conceptualization, Investigation, Methodology, Visualization, Writing – original draft

  * E-mail: z.zahedi.2@cwts.leidenuniv.nl

  Affiliation Centre for Science & Technology Studies (CWTS), Leiden University, Leiden, the Netherlands

  http://orcid.org/0000-0001-5801-1886

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• Rodrigo Costas

  Contributed equally to this work with: Zohreh Zahedi, Rodrigo Costas

  Roles Conceptualization, Supervision, Writing – original draft, Writing – review & editing

  Affiliations Centre for Science & Technology Studies (CWTS), Leiden University, Leiden, the Netherlands, DST-NRF Centre of Excellence in Scientometrics and Science, Technology and Innovation Policy, Stellenbosch University, Stellenbosch, South Africa

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