Google completed its $1.65 billion stock acquisition of YouTube. When Google acquired YouTube, YouTube had already become the leading video platform in the world. Back then, it was Google's second-largest acquisition.
BBC News - Google buys YouTube
Google Buys YouTube-KQED "This Week in Northern California"
Google Buys YouTube For $1.6B: CBS News
HipMojo 8A: Google Buys YouTube on October 9th 2006