Article level metrics provide data on the article level, rather than the journal.
Altmetrics Manifesto “No one can read everything. We rely on filters to make sense of the scholarly literature, but the narrow, traditional filters are being swamped. However, the growth of new, online scholarly tools allows us to make new filters; these altmetrics reflect the broad, rapid impact of scholarship in this burgeoning ecosystem. We call for more tools and research based on altmetrics.”
Read this primer for a great overview. Or watch this video:
Article level metrics can be found:
Public Library of Science (PLOS) provides the following metrics:
Altmetric is a tool that is available to help you track the impact of individual articles. It is available as a bookmarklet for personal use, as well as being installed with some our electronic resources.