AFAIK any skepticism regarding the purchase of YouTube has been borne out. They have owned it for 4 years and so far it has never been profitable. So far Google has lost billions on YouTube.
Unlike YouTube Groupon is actually profitable. (ergo apparently going for 4x YouTube's price tag) The question with Groupon will be their ability to maintain profits.
Unlike YouTube Groupon is actually profitable. (ergo apparently going for 4x YouTube's price tag) The question with Groupon will be their ability to maintain profits.