If you want to search in various free file sharing sites, Gammafiles is a search engine that will enable you to search files both on MegaUpload and RapidShare. No sign is required for using Gammafiles.
Gammafiles is easy to use for searching files first type your keyword Gammafiles will give you file name, accuracy, file type and size.
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How do free movie streaming sites make money ?? I would guess that it would be difficult to earn income from legal movie streaming sites !