 " Somebody That I Used To Know " reached number one in more than 23 national charts and charted inside the top ten in more than 30 countries around the world . By the end of 2012 , the song became the best @-@ selling song of that year with 11 @.@ 8 million copies sold , ranking among the best @-@ selling digital singles of all time . As of April 2012 , it is the most downloaded song ever in Belgium , as well as being the third best @-@ selling digital single in Germany with sales between 500 @,@ 000 and 600 @,@ 000 copies , and the most successful song in the history of the Dutch charts . As of January 2013 it has received eleven Platinum certifications in Australia , accounting for shipments exceeding 770 @,@ 000 units . In New Zealand , it was certified four times Platinum . The song was the best @-@ selling single of 2012 in the UK with 1 @,@ 318 @,@ 000 copies sold . 
