Online auction site eBay is once again expanding its portfolio of on the web properties, this time announcing it is purchasing community-driven Web site suggestion service StumbleUpon for about $75 million.Founded by in Calgary by three Canadian software developers but currently based in San Francisco, StumbleUpon is built around the idea that instead of searching for interesting Web sites in a brute-force manner using a traditional search engine, users can have interesting sites suggested to them based on their personal preferences and the types of sites enjoyed by other people with similar likes and dislikes. StumbleUpon users rate site they encounter, and can see lists of sites th

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