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1) London 2012 Youtube Channel: Youtube has been the first choice to live stream big events of the world. London 2012 Youtube Channel will be live streaming the whole opening ceremony of the London Olympics 2012 tournament. Go to London 2012 Channel on Youtube.
2) NBCOlympics: This website will also be covering full tournament. You can get news, results, videos, photos, highlights, etc through NBC Olympics. Do subscribe to the website if you want to receive latest news about the games. Head over to NBC Olympics website.
3) BBC Sport: Facebook users can watch the opening ceremony without having to leave their favorite website, as BBC Sport will be live streaming everything about London Olympics (Yes, the opening ceremony as well) on their Facebook page. The link to the BBC Sport Facebook app is here.