Wikipedia's amazing success relies on the knowledge and time of millions of users creating and editing articles. A lesser known (nevertheless brilliant) example is what I bumped into recently.
Most of us would have identified distorted images of a word before creating an online account. While the main purpose of that is to differentiate between a human and a rogue program (which can create millions of spam accounts), Luis Von Ahn (a professor from CMU) uses this technique to help digitize books. If you wonder how this process of identifying distorted word images can help digitize books, watch this video
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