GT Tokyo used a genuine long distance couple for this campaign. They ran a 1,000km marathon, and images of the two were broadcasted live on the internet for a whole month. The couple were allowed to keep in contact only through blog, TV phone and SMS messages. Thus all correspondence between the couple was displayed to the public on the internet. This also provided users with a simulation of a long distance relationship. The men's site and the women's site were created separately; on the day of completion, the two sites come together as one. And that was when the name of the client and the product was revealed.

Source:
http://awards.dandad.org/2009/categories/onln/online-advertising/25046/love-distance