Hundreds of research papers are published every day worldwide. But which articles are most discussed and in which circles? To find out, Altmetric in London traced how often papers were noted in 14 digital channels, ranging from the serious (5,000 research blogs and Mendeley, an academic citation network) to the trendy (Twitter, Facebook) and everything in between (including 1,000 news outlets). Altmetric poured data for 2014 into an algorithm that created scores; the top 200 articles are mapped here.