A new kind of pub crawl

Web­sites like Face­book, LinkedIn and other social-​​media net­works con­tain mas­sive amounts of valu­able public infor­ma­tion. Auto­mated web tools called web crawlers sift through these sites, pulling out infor­ma­tion on mil­lions of people in order to tailor search results and create tar­geted ads or other mar­ketable content.

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