Crowdsourcing can build virtual community, engage the public, and build large knowledge databases about science and culture. But what does it take, and how fast can you grow?
For some insight, we look at a crowdsourced history site: Historypin is an appealing database of historical photos, with dates, locations, captions, and other metadata. It’s called History “pin” because the photos are pinned on a map. (See recent article about Changes over time, in photos and maps.) Some locations have photos from multiple dates, showing how a place has changed over time, or cross-referenced with Google Maps StreetView. Currently, Historypin has 308k items, from 51k users, and 1.4k institutions. This is a graph of pins over the last three years: