Japanese clothing store UNIQLO recently launched a great new interactive campaign. The mechanism is simple, just tweet about any of the items listed, and the price of that item gets discounted!
The mechanism was built in to the website (Click here), and the clothing items listed dropped pretty much to cost price, for example the price of a jacket can fall from £60 to just £20. The campaign finishes on the 9th September, and so far half of the products listed have already reached their bottom price.
Brilliant idea and wonderfully simple activation.