Biggest Loser, season two

Reality show The Biggest Loser had been a huge success for NBC, and as season two approached, the network wanted to insure that the hit would reenter the public's consciousness even bigger than before. They also wanted to reward the fans' dedicated allegiance to the show. So NBC ran 10-second spots on-air, offering viewers the chance to preview the season premiere of Biggest Loser at a House Party they would host, two weeks before the show's on-air broadcast. Thousands of fans responded, and House Party's proprietary technology chose the 1,000 fans who were most likely to throw big parties, take lots of pictures and video, and—most importantly—virally spread the word.

The 1,000 fans who were chosen were part of an unforgettable event. At the parties (which, as usual, all took place on the same day), hosts and guests watched the season premiere episode, and then they reenacted the action of the show: they enjoyed themselves at the party, and then all began a diet together. The climax of party night was when Biggest Loser's stars dropped in on several lucky—and surprised—parties. And in the days after the show, the communities that were spawned by the Biggest Loser House Party followed the show faithfully, and at the same time supported each other as they themselves strived to lose weight.