A location-based, community-driven question and answer service built atop Google App Engine.
Some ideas for future work include the following:
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Make better use of Memcache
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Use MapReduce to iterate over all questions and answers, determine trending/popular ones, to help identify hot activity zones.
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Benchmark performance/load characteristics to expose bottlenecks
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Improve Search & Prospective Search features
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Multiple Prospective Search locations per user
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Add more features for a richer user experience