Amid chatter of " Facebook fatigue," real or imagined, the world's biggest social networking company is getting ready to unveil a new version of News Feed, the flow of status updates, photos and advertisements its users see on the site.

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The event comes a month after a Pew study reported that many Facebook users take a break from the site for weeks at a time. The report, from the Pew Research Center's Internet and American Life Project, found that some 61 percent of Facebook users had taken a hiatus for reasons that range from boredom to too much irrelevant information to Lent.

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