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While Google, Yahoo and MSN are probably the first names that come to mind when you think of search engines, there are millions of other search engines on the web too. Despite what many people think, there are fascinating search engine innovations out there, such as social search engines, celebrity search engines, search engines that pay you to search and others that donate to charities or plant trees to reward users for their curiosity.

Here's a look at some of the most interesting search engines we've featured on Trend Hunter.