IKEA - Facebook showroom

Viral Video Summary:
Swedish agency Forsman & Bodenfors created a Facebook profile for IKEA store manager, Gordon Gustavsson. The team then uploaded IKEA showroom images to the facebook photo album over a two week period. Facebook friends of Gustavsson could then win the object that they had tagged on the photo for free. The campaign took off like wildfire and I would say it's an ingenious way of really  effective advertising.

Though not exactly the newest of viral but I'll just put this up for anyone who hasn't seen it.