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This summary is machine-generated.

Fact-checking messages for COVID-19 vaccines decreased post-May 2020, but posts became more confident. Hospital-shared information fostered positive vaccine attitudes, though engagement was lower, suggesting a need for enhanced social media strategies.

Keywords:
COVID-19COVID-19 vaccinefact checkinghealth informationinfodemicmisinformationmisinformation correctiononline informationpublic sentimentsentiment analysissocial mediavaccination

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Area of Science:

  • Public Health
  • Social Media Analysis
  • Vaccine Communication

Background:

  • Combating COVID-19 vaccine misinformation is crucial.
  • Fact-checking messages are key interventions against antivaccine sentiments.
  • Addressing vaccine hesitancy requires effective communication strategies.

Purpose of the Study:

  • Analyze changes in public attitudes towards COVID-19 vaccines.
  • Evaluate the impact of vaccine fact-checking on social media engagement and attitudes.
  • Examine the linguistic and emotional characteristics of vaccine fact-checking content.

Main Methods:

  • Collected 12,553 COVID-19 vaccine fact-checking Facebook posts and 122,362 comments (Jan 2020–Mar 2022).
  • Employed natural language processing and statistical analyses.
  • Investigated trends in public attitudes, engagement, and content features.

Main Results:

  • Fact-checking posts peaked in May 2020 and then declined.
  • Third-party fact-checkers' role increased over time.
  • Posts became more analytical and confident; comment tentativeness decreased.
  • Hospital posts generated positive attitudes but lower engagement.

Conclusions:

  • The proportion of vaccine fact-checking content diminished as the pandemic evolved.
  • Third-party fact-checkers and analytical, confident messaging became more prominent.
  • Hospital-based vaccine information positively influenced attitudes, despite lower engagement.
  • Hospitals should enhance social media campaigns for greater public health impact.