August 7 2009 was its official release, but it only reached #1 in January 2010
So you might've already known it in August
I definitely knew it in August. When was the date it leaked? I remember the confusion of what the title was with "Dolla", "P Diddy", "Don't Stop" and a bunch of other names. Oh how that song changed my life.
I found out about TiK ToK by randomly scrolling through the top 100 on itunes in August. It was my guilty pleasure and I had no idea it was going to blow up like crazy!
or 
..........
