Most of the tools to measure Altmetrics are subscription-based; the Libraries do not currently have access to those.
What Are Altmetrics?
Simply put, altmetrics, are measurements of the impact and reach of a publication outside of the typical publication venue -- the journal. Instead, altmetrics track mentions of publications on such platforms as social media, media, and reference managers (more types of documents and sources are included; these are just examples). These metrics are meant to be complementary to traditional methods, such as impact factor and h-index, and, by doing so, provide a more comprehensive understanding of the actual impact of a publication.