In 2013, Facebook began providing organisations the option of allowing users to post ratings ranging from one to five stars on their official Facebook pages.
The current study was designed to compare hospitals' 30-day readmission rates with their Facebook ratings.
The investigators analysed data available from Hospital Compare - a website sponsored by the Centre for Medicare and Medicaid Services - on 30-day readmission rates for 4,800 US hospitals.
While more than 80 per cent had rates within the expected national average range, 7 per cent had significantly lower-than-average readmission rates - a measure that reflects above-average care - and 8 per cent had rates that were significantly higher than average.
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Low-readmission hospitals were more likely to have Facebook pages than were high-readmission hospitals - 93 per cent versus 82 per cent - and more than 80 per cent of those in both groups with Facebook pages provided the five-star rating system.
Comparison between the two groups revealed that each one-star increase in a hospital's Facebook rating was associated with a greater than five-fold increase in the likelihood that it would have a low, rather than a high readmission rate.
"We found that the hospitals in which patients were less likely to have unplanned readmissions within the 30 days after discharge had higher Facebook ratings than were those with higher readmission rates," said lead author McKinley Glover, a clinical fellow in the Massachusetts General Hospital (MGH) Department of Radiology.
"Since user-generated social media feedback appears to be reflective of patient outcomes, hospitals and health care leaders should not underestimate social media's value in developing quality improvement programmes," said Glover.
The study was published in the Journal of General Internal Medicine.