has been set up in 2011 as a commercial enterprise providing social media outreach for individual researchers and publishers. Its goal is to provide its customers information about the attention a single article receives. Altmetric.com has established a composite indicator that combines different sources
of data (news, videos, policy documents, Facebook, Twitter, LinkedIn, and Pinterest), resulting in a single indicator visualized by different colours which is often termed ‘altmetric donut’. The altmetric donut aims to inform about both ‘the quantity and quality of attention received by each item, applying some kind of control for gaming’.