When looking for quality content regarding a specific issue that I need to research I find myself using the Hubpages search engine feature to find articles that can address the topic. For many things, it has now become a consistent Google replacement and this is because I more trust the quality and consistent research of the writers here. It opens the question as to what is a search engine, but I also like the fact that I am giving a community member another page impression and rating or comment. The best search engine will deliver what you are looking for and increasingly this is hubs.
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Despite its outlandish name, the DuckDuckGo.com search engine seems to be getting quite a sizable share of visitors. I try to incorporate it into my searching when feasible to maintain variety.
Yes I agree that other alternatives exist for scholarly search engine needs. But, with the Google search engine holding such a dominate market position, imagine if everyone just used a Google replacement even if for only 1 or 2 searches a day.