@misc{Tjaden2021,
  author    = {Tjaden, Jasper},
  title     = {Measuring migration 2.0},
  series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe},
  journal   = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe},
  number    = {149},
  issn      = {1867-5808},
  doi       = {10.25932/publishup-55387},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-553873},
  pages     = {20},
  year      = {2021},
  abstract  = {The interest in human migration is at its all-time high, yet data to measure migration is notoriously limited. "Big data" or "digital trace data" have emerged as new sources of migration measurement complementing 'traditional' census, administrative and survey data. This paper reviews the strengths and weaknesses of eight novel, digital data sources along five domains: reliability, validity, scope, access and ethics. The review highlights the opportunities for migration scholars but also stresses the ethical and empirical challenges. This review intends to be of service to researchers and policy analysts alike and help them navigate this new and increasingly complex field.},
  language  = {en}
}
@misc{TjadenHaarmannSavaskan2022,
  author    = {Tjaden, Jasper and Haarmann, Esther and Savaskan, Nicolai},
  title     = {Experimental evidence on improving COVID-19 vaccine outreach among migrant communities on social media},
  series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe},
  journal   = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe},
  number    = {156},
  issn      = {1867-5808},
  doi       = {10.25932/publishup-58740},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-587409},
  pages     = {10},
  year      = {2022},
  abstract  = {Studies from several countries suggest that COVID-19 vaccination rates are lower among migrants compared to the general population. Urgent calls have been made to improve vaccine outreach to migrants, however, there is limited evidence on effective approaches, especially using social media. We assessed a targeted, low-cost, Facebook campaign disseminating COVID-19 vaccine information among Arabic, Turkish and Russian speakers in Germany (N = 888,994). As part of the campaign, we conducted two randomized, online experiments to assess the impact of the advertisement (1) language and (2) depicted messenger (government authority, religious leader, doctor or family). Key outcomes included reach, click-through rates, conversion rates and cost-effectiveness. Within 29 days, the campaign reached 890 thousand Facebook users. On average, 2.3 individuals accessed the advertised COVID-19 vaccination appointment tool for every euro spent on the campaign. Migrants were 2.4 (Arabic), 1.8 (Russian) and 1.2 (Turkish) times more likely to click on advertisements translated to their native language compared to German-language advertisements. Furthermore, findings showed that government representatives can be more successful in engaging migrants online compared to other messengers, despite common claims of lower trust in government institutions among migrants. This study highlights the potential of tailored, and translated, vaccination campaigns on social media for reaching migrants who may be left out by traditional media campaigns.},
  language  = {en}
}