Nick D'Aloisio, founder of Summly, a mobile application that summarizes news articles for small-screen devices, poses for a photograph in London, U.K., on Tuesday, March 26, 2013. Yahoo! Inc., the largest U.S. Web portal, is paying about $30 million to buy Summly, a mobile startup run by 17-year-old D'Aloisio, according to a person familiar with the transaction. Photographer: Matthew Lloyd/Bloomberg via Getty Images