Can anyone recommend a good referral program for our pre-launch? entrepreneur how earn by blogging blog

I have a bunch of gaming keyboards I'd like to giveaway to our beta signups that refer the most friends.

Is there any service that offers some sort of leaderboard system for referrals so we could track say the top 3 people that referred the most people to sign up with those and they would win the keyboards? (We Have 400 beta signups so far)

Keep if fun and competitive but also with a nice prize at the end.

submitted by /u/Awacs88
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