What are other methods of searching for things online other than search engines?

I know there are tons (almost infinite) things in this world, and almost infinite things/ways within those topics of doing them....

but in terms of searching online for things, what other methods are there other than, search engines, bookmarking sharing sites, and sites like digg?

I know there are huge amounts of them out there, and there is no way anyone will ever likely hear about them all....

but what are some other methods of searching online that you know of? and what are examples of those methods, if possible?

Thanks!




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