tag:bbc.co.uk,2008:cps:playlist:story:7961889 Shepherds reveal viral ad secrets A group of shepherds talk about the challenges of making an 'extreme shepherding' internet ad for Samsung and YouTube. The shepherds claim it was "good dogs and good sheep", not computer trickery. 2009-05-01T14:08:37Z News 7961889 40053 true tag:bbc.co.uk,2008:cps:advert:story:7961889 tag:bbc.co.uk,2008:cps:ident:news:video:512x288 tag:bbc.co.uk,2008:cps:story:7961889 tag:bbc.co.uk,2008:cps:playlist:story:7958504 Today's viral video ad The Today programme challenged a viral marketing firm to create a viral advertisement for the internet. How did it do? tag:bbc.co.uk,2008:cps:playlist:story:7900919 Dancing Matt Matt Harding, who has travelled round the world, explains how one of the internet's most well-known viral advertisements came about.