Concerned About Facebook's Web Tracking? You Already Gave Your Permission21
Online retailers and publishers are pushing back against Facebook Inc.'s efforts to track users across the Internet, fearing that the data it vacuums up to target ads will give the social network too much of an edge.
Web traffic experts say there is less data flowing from some sites to Facebook, suggesting they have been reprogrammed to hold back information.
Facebook has long kept track of the websites its users visit when...
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