She said the study raises questions about the emotional cost, particularly for young people, of heavy reliance on a torrent of news snippets delivered via TV and online feeds such as Twitter.

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Others are providing customers with online newsletters or blog feeds.

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This digitally-savvy campaign includes Foursquare location based tours, online interactive maps, and active Twitter and Facebook feeds.

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Twitter feeds, Facebook pages, MySpace profiles and Flickr, an online photo album, will be on offer as well as YouTube.

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Online retailers have to start making sure that when consumers dial into their feeds on social networks, they find and stumble upon their products.

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Those 4% of US online adults might be very avid users, whose existence ( personally or professionally) relies on these feeds.

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