Celebrate the dreary weather that's going to mark most of the Western Hemisphere for the next couple of months with a new Facebook campaign by Hunter Boots and We Are Social. A Facebook app lets you win a prize based on what the weather in London is going to be that day. Fans can create their own photo based on London's forecast, and the winning image every day will get a prize that corresponds to what the skies are like -- wool socks if it snows, wellies if it rains, and so on.