What’s the data-driven journalism crowd tweeting about? Here are the week’s Top Ten links for Feb. 27-Mar. 5: cool #NICAR15 tools + tutorials (@MacDiva), mapping power in Africa (Guardian), how to find, extract + use #OpenData (IJNet), and the history of immigration in England + Wales (Times of London). As always, this list is determined by NodeXL, a social media network mapping program. The full map is available at the bottom of this roundup.