Bing already claimed its title as the world's second favorite search engine, but in the US it has continued to lag in third place behind Yahoo!. The gap is closing rapidly, however, with ComScore's latest stats revealing a 15.0 percent share for Redmond versus Yahoo!'s 15.1 percent. What's more, those figures don't reflect mobile search, which must surely be a growth area for Bing as Windows Phone gathers American followers. Meanwhile, Ask Network remains static in fourth place and AOL (Engadget's parent company) comes a distant fifth -- although it did show a little growth spurt between October and November, taking 1.6 percent of the 17.8 billion recorded searches and pretending not to notice Google way up there on top. Full ranking after the break.