A Pew Study published today suggests up to three-quarters of Americans have taken steps to either tighten their Facebook security or distance themselves from the site entirely — both reflections of a certain loss of naivety in the site’s audience. According to the study, 74 percent of users have either adjusted their privacy settings, taken an extended break from the site, or outright deleted the app from their phones — a full 24 percent of the latter. All of the participants have taken these actions over the last year. Users didn’t say exactly why they’d taken these steps, but the…

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