How Many Grains of Salt Must We Take When Looking at Metrics? - The Scholarly Kitchen

"All metrics come with an asterisk, a caveat, a grain of salt — or several grains of salt. What follows is a review of some of the strengths and limitation of different metrics around citation, attention, and usage. For each product or platform, I am making a judgement on how many grains of salt one should keep in mind when using the data."