We use CTP for our advertising. But not only do we advertise we can build teams and playing games to learn to create and build relationships along the way. Many on our team are learning how to build lists and how to use autoresponders to do that. With CTP they take the boaring out of just surfing, you can surf and chat and collect XP (Experience Points) and collect badges.
CTP has also created team challenges that if your team has enough points to play , you get positioned to go head to head with other team. Win and you move on , loose your out and when its all over you can choose to do it all over again for Big Prize money.