Interesting post by Aditya Agarwal about how facebook created their own search engine. Facebook is a closed system and not spidered by google with 30 millions users wanting search.
What they did was spider their own site and created a reverse-index.
Heres some staggering facts:
- Over 600 million searches per month.
- Approximately 1 terabyte of in-memory data.
- Average search query time of less than 100ms.
The results are more relevant because its based on your social graph distance. ie People you know are more relevant.
Nicely done.
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