 In Europe , the song debuted at number thirty @-@ eight in Sweden on the issue dated October 23 , 2009 , and managed to peak at number three . The song debuted at thirty @-@ nine in Denmark and peaked at number three . In Norway , the song debuted at number eleven and peaked at number three . In the United Kingdom , " Tik Tok " debuted on the official UK Singles Chart at number six on November 8 , 2009 , and over a period of just under three months climbed to a peak of number four on January 3 , 2010 . In 2010 , The UK Official Charts Company ranked " Tik Tok " at 100 on their list of the best @-@ selling singles of the 21st century . 
