This photo combo of images shows, clockwise, from upper left: a Google sign, the Twitter app, YouTube TV logo and the Facebook app. Facebook has taken the lion's share of scrutiny from Congress and the media for its data-handling practices that allow savvy marketers and political agents to target specific audiences, but it's far from alone. YouTube, Google and Twitter also have giant platforms awash in more videos, posts and pages than any set of human eyes could ever check. Their methods of serving ads against this sea of content may come under the microscope next. (AP Photo)
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