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For the most part, yes. For example, if you search “using” Yahoo, you are actually using Bing. However, there is a much greater degree of privacy when you use ixquick and duck duck go. Think of it like searching Google (or whichever search engine they are using) through a proxy. The results may be similar, but depending on the options, you may not be adding to the trail of information associated with your IP address the way you are if you just directly use Google or Bing.