Facebook founder and CEO Mark Zuckerberg has downloaded the Viddy app and is testing it out under the user name Zuck. His first uploaded video is of his dog Beast scratching at the floor of Zuckerberg’s house. The video has over 1,200 likes from other Viddy users. Viddy has often been coined as an “Instagram for video.” Facebook CEO Mark Zuckerberg conducted the $1 billion acquisition of Instagram entirely on his own without lawyers or bankers present. Viddy has recently surpassed 15 million users and Zuckerberg’s use of the app further validates how popular the service is becoming. Last week Viddy raised a new round of funding from Biz Stone, Josh James, Jeff Kearl, Roc Nation (Jay-Z), Overbrook Entertainment (Will Smith), Brian Lee (ShoeDazzle founder), Gerard Pique, and Shakira.