In random news of the day, singer M.I.A. and mild-mannered CNN news anchor Anderson Cooper exchanged some words on social network Twitter yesterday. In the midst of M.I.A. promoting a news doc that was airing called “Sri Lanka’s Killing Fields: War Crimes Unpunished,” she accused Cooper of calling her a terrorist back in 2009. Anderson was very calm about it all, and politely checked her, letting her know she had her facts all wrong. Check out their exchange below. Marisa Mendez