The UFC’s roster of champions was shaken up Thursday after Georges St-Pierre vacated the middleweight title and Robert Whittaker was promoted from interim to undisputed champion. St-Pierre’s (26-2 MMA, 20-2 UFC) recent medical issues forced him to give up the strap . As a result, Whittaker (19-4 MMA, 10-2 UFC) puts his crown on the line against ex-champ Luke Rockhold (16-3 MMA, 6-2 UFC) on Feb. 10 at UFC 221 in Perth, Australia. Check below to see the top Twitter reactions to today’s big news