Introduced in 2005, YouTube has revolutionized the way people watch videos on the internet. The video-sharing site allowed anyone to upload their videos with ease. The company was purchased by Google in 2006 for $1.65 billion and has grown into a powerhouse of media. Today, the site has 1 billion users who collectively watch about 4 billion videos per day. The company has an estimated revenue of more than $4 billion. YouTube has also given rise to a new avenue for entertainment, with video bloggers (or vloggers) gaining millions of fans, with several of the most popular ones even breaking through to the mainstream.