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While this is great for LinkedIn, it also reminds me of how plain and unusable Facebook's search is by comparison. LinkedIn has a solid number of advanced options for its search to begin with; with the new faceted search, it really leaves Facebook's search in the dust. Wouldn't it be nice if you could, for example, search Facebook only for friends of friends, living only in Canada? For now, it's wishful thinking (Facebook does let you filter people search results by school, workplace and location, but the location filter leaves something to be desired. For example, neither "Canada" nor "Zagreb" are viable options.)
Check out a video overview of LinkedIn's faceted search in the video below.