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This chapter discusses altmetrics (short for "alternative metrics"), anapproach to uncovering previously-invisible traces of scholarly impact byobserving activity in online tools and systems. I argue that citations, whileuseful, miss many important kinds of impacts, and that the increasing scholarlyuse of online tools like Mendeley, Twitter, and blogs may allow us to measurethese hidden impacts. Next, I define altmetrics and discuss research onaltmetric sources--both research mapping the growth of these sources, andscientometric research measuring activity on them. Following a discussion ofthe potential uses of altmetrics, I consider the limitations of altmetrics andrecommend areas ripe for future research.

Altmetrics (Chapter from Beyond Bibliometrics: Harnessing Multidimensional Indicators of Scholarly Impact)