U.S. Billboard chose Psy's "Gangnam Style" as this year's 'Top Trending' video on YouTube.

YouTube also announced yesterday that "Gangnam Style" as the most popular video.

Carly Rae Jepson's "Call Me Maybe" was also chosen as one of this year's top videos.

The popularity that was received through YouTube helped Psy become number 1 on charts and become a mainstream artist.