The Biggest Spider Based Search Engines
1. Google
2. Yahoo
3. MSN
4. Teoma/Ask
5. Gigablast
6. Walhello
7. Exalead
The ranking is based on reviews of search engine literature and different test performed to get an estimate of index size and depth. The engines mentioned above are the only global spider based search engines we could found having an index of more than 1 billion pages.
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