The song went to the top of iTunes in the United States just an hour after it was released on Monday, and has since reached No. 1 in Australia, Canada, Brazil, Finland and 20 other nations."
"Released on Monday night, the song is reportedly heading to first-week downloads in the 600,000 range, which would make the breakup anthem the fastest selling song ever by a female artist. (Lady Gaga currently holds that record with “Born This Way,” which was downloaded 448,000 times in its first frame.)
There’s one song Taylor probably will probably not outsell, though: “Right Round” by Flo Rida feat. Ke$ha, which sold 636,000 songs in a single week in 2009. Still, if she climbs past Justin Bieber’s “Boyfriend,” which moved 521,000 editions in its first week, she’ll have the second-best sales week in digital history. Not too shabby."
Source | Source