Roc Nation, the entertainment company created by Jay-Z and Live Nation, has announced that they've signed M.I.A. to a management deal (she'll maintain her record deal with Interscope). She joins the ranks with other Roc-signees Santigold, her longtime collaborator Switch and Rihanna, who congratulated M.I.A. this afternoon. M.I.A. is currently finishing her fourth full-length, Matangi, as well as a self-titled autobiography which should be out in October. M.I.A. is currently working on a remix for her song "Bad Girls" with her protege, Rye Rye, Missy Elliott and Azealia Banks. Following this development, perhaps Rihanna will jump on too?