#virality

Design the UI and logic for a Dropbox/Robinhood style referral loop. Features: 1. Clear 'Earn X for referring Y' headline. 2. Progress bar for 'Referral Milestones'. 3. One-click social share links. 4. Leaderboard showing top referrers. 5. Double-sided reward logic (Both parties benefit). High-virality growth engine.