This is a Snowball Metric. For more information on Snowball Metrics, click here.
Altmetrics are article level metrics that complement traditional metrics as a way of gauging attention (both academic and non-academic). They are harvested from news outlets, reference managers, social media and blogs, to name a few. Altmetrics measure public attention, not quality. People pay attention to papers for all sorts of reasons, not all of them positive.
The Library, Technological University of the Shannon: Midwest