Via Crossref (a not-for-profit membership organization for scholarly publishing working to make content easy to find, cite, link, and assess) – “As part of our Event Data work we’ve been investigating where DOI resolutions come from. A resolution could be someone clicking a DOI hyperlink, or a search engine spider gathering data or a publisher’s system performing its duties. Our server logs tell us every time a DOI was resolved and, if it was by someone using a web browser, which website they were on when they clicked the DOI. This is called a referral…This chart shows the top 10 referring non-primary-publisher domains of DOIs per month. Because the top 10 can be different month to month, the total number of domains mentioned can be more than 10. Subdomains are combined, which means that, for example, the wikipedia.org entry covers all Wikipedia languages. This chart covers all of 2015 and the first two months of 2016…”