Avast- free antivirus (reward program)

Prize giveaways from Avast (6 x 1000$, 10 x 1000$, 1 x 10000$)

$1,000 x 10

10 prizes to the 10 persons with the best recommendation tactics

$1,000 x 6

6 prizes to the 6 persons who recommend the most on their own continent

$10,000

1 grand prize to the person who recommends the most friends