18. Bad Romance: Lady Gaga's "Bad Romance" music video currently holds the number 2 slot for top ten views. Gaga also has her own YouTube channel where she recently addressed the U.S. Senate advocating marriage equality.
19. JK Wedding Entrance Dance: Groom and bride Kevin and Jill didn't save the dancing for their wedding reception. The pair and their entire wedding party grooved down the aisle, busting some dance moves to Chris Brown's "Forever." Today, the couple is using publicity from the video to encourage donations to a domestic violence charity.
20. United Breaks Guitars: YouTube can prove to be a PR nightmare for companies, as it did in 2009. Musician Dave Carroll was so upset when United Airlines mishandled and broke his $3,500 guitar, he wrote a catchy tune that quickly garnered media attention across the country.