This was a real layup: YouTube has added ‘click-to-buy’ links in order for users to buy products related to the content they watch on the video site. First out of the gate are embedded iTunes and Amazon.com links, placed on the watch page beneath the video. Google says the retail links are just the beginning of building an e-commerce platform on YouTube (which Google acquired in October 2006 for $1.6 billion). In a related item, MarketWatch reports that as part of its copyright infringement lawsuit against YouTube Viacom has targeted the venture capitalists behind the video-sharing site to find out why they chose to invest in it and subsequently sell it to Google.