Wunderman Buenos Aires was given the task to launch the new Nokia N8 smart phone. So they created a twitter based activation campaign called #The8N8.
To start with, Nokia enlisted top celebrities to help tweet various questions, clues and features of the phone. Users had to then find these clues, follow the celebrity and respond to those tweets correctly in the fastest time in order to earn the celebrity follow back. The first 8 people to get 8 celebrities to follow them back won the new Nokia N8.
The campaign was successful as Nokia was able to reach 300,000 Twitter users. They also managed to increase their fan base on Twitter and Facebook by over 100%!