Did any entity in the technological world have a better year than Twitter? It opened 2009 as a curious service that only seemed interesting if you were Ashton Kutcher, but it’s going to close out the year as an indispensible tool for keeping in touch with people and following your favorite celebrities. But who ruled Twitter in 2009? The company just released their list of the top Trending Topics for the year, and it offers up a pinpoint-accurate microcosm of the year that was. The list of the most talked-about people on Twitter in 2009 is dominated by figures from the music world. Not surprisingly, Michael Jackson topped the list..