I think there’s a big opportunity for a gamified, social spaced repetition app. Ideally would have an API so websites could add new cards to your stacks in one click. Imagine reading a great blog post and being able to instantly add its insights to your spaced repetition system.
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With a playful UX (zenly, duo lingo or tiny cards are good examples), and leveraging people’s competitive instincts (leaderboards, streaks, challenges, badges…)
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