Visitors to YouTube , which now boasts the Internet's second-largest search engine, have uploaded hundreds of millions of videos since its launch in early 2005. For most people YouTube (Google bought the video-sharing site for $1.65 billion in late 2006) is a valuable outlet for sharing personal videos, catching up on college lectures, consulting "how-to" clips and absorbing pop-culture nuggets like "Weird Al" Yankovic's parody of Lady Gaga
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