Scour.com launched as a "meta" social search engine, which encourages voting and commentary on search engine query results called from Google, Yahoo! and MSN. Scour differentiates itself from other social search, ratings, and community sites in that it lets users vote and comment on search results, provides privacy control, gives weight to preferred engines, and lets people redeem search points for VISA gift cards. Scour pulls search results from the top three search engines. From there it relies on feedback to make the results ever more relevant. After enough votes on results, a search result can rise or fall in ranking which will make listings across all the engines more relevant on Scour.