Moto 360 giveaway fails: was it Motorola or Yo's fault?

Today was supposed to be a big day for 20 Moto 360 fans, because Motorola ran a giveaway promotion through the Yo app. The contest was simple: when you received the Yo message from Motorola, follow the link, and the first 20 people to complete the form won a Moto 360. Unfortunately, the giveaway failed and that wasn't what happened.

What actually happened is that a lot more than 20 users were shown a screen saying, "Yo! You won a Moto 360!" But, once they put an email address into the form, users were then greeted with a more somber message saying, "Yo, unfortunately all Moto ...