Notes : Rapper B . was ` ` nervous and not happy , '' a source says . NBC says its system was late to obscure the gesture . The NFL says the gesture was inappropriate and disappointing . The halftime show averaged 8,000 tweets per minute .
NEW : Rapper M.I.A . was `` nervous and not thinking , '' a source says . NBC says its system was late to obscure the gesture . The NFL says the gesture was inappropriate and disappointing . The halftime show generated 8,000 tweets per second .