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Although using metasearch engines as web search tools may reduce your time of searching because you do not have to go from one subject directory to another and one search engine to another, it is not as good as you think it is. That is because the search results that these metasearch engines can give may not be as high quality as when you search in search engines and subject directories one by one. There are some information in the web that metasearch engines can get even if search engines and subject directories can get. So, there are a lot of results but those may not be reliable enough.