The viral leaderboard contest is a brand new contest type. It is similar to the viral sweepstakes contest (which was previously just called "viral contest") but has several key differences.
1. Users can see where they stand on a "leaderboard." Generally this type of contest would be used for things like waiting lists, contests where the top user wins, etc.
2. You can send prizes or opt-in bribes for any number of entries with a viral leaderboard. For example, you can send opt-in bribes if they hit 100 entries, 200 entries, AND 300 entries if you so wish. Inside the viral sweepstakes contest, you may only send opt-in bribes for one prize level (for example, 10 entries).
3. To preserve the virality & effectiveness of this type of contest, you cannot set how many referral entries a user gets inside a viral leaderboard.
4. Viral leaderboard allows you to set prizes for rankings, for example, you can award prizes to the top 3 ranks.