Facebook has stopped using Microsoft Bing to power searches via its social network, ending a partnership that spanned almost two years. What isn’t clear, however, is who broke up with whom. In January 2013, Facebook launched Graph Search, a search bar at the top of each Facebook page. Type in “friends who live in San Francisco,” and you’ll receive a list of friends who live in the city. Before now, however, if you typed in a mundane term like “baseball,” Facebook would suggest a list of related terms, but redirect the search to Bing if you insisted on “baseball” itself. No longer.