Last night, Messi scored his 50th goal of the season.
Why is it considered a new goal-scoring record? Dixie Dean scored 60 goals for Everton in the FA First Division alone (he had 67 in total) in the 1927-1928 football season.
Messi had 50 goals in La Liga and another 14 goals in the Champions League, 3 goals in the Spanish Cup, 3 goals in the Spanish Supercup, 1 in the UEFA Super Cup and 2 in the Club World Cup. Which makes 73 goals in total on 2011/2012.
Messi didn't break Dean's record but he has broken a lot of other records: