There is still an opportunity for a high performance, reputation savvy, domain specific social search engine that could make volume less of an issue.

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On the other hand, someone who searches for a specific job on a search engine or decides to look at a certain company's website probably has more relevant experience, he said.

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However, this new feature is more directed and specific and makes it halfway in between a search engine and what StumbleUpon used to be.

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These spammers send e-mails directing users to a particular search engine where they are told to enter specific key words.

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