Facebook Inc. unveiled updates to the Groups feature of its main social network, doubling down on a successful but controversial part of the big blue app--and another sign that Facebook is moving toward more private, intimate communication.
The changes, announced Tuesday at the company’s annual F8 conference in San Jose, California, make Groups a bigger part of the Facebook user experience. A new design for the Facebook mobile app highlights the Groups that users have joined, and now shows a personalized feed of activity across all the groups people are part of in a special tab.
Facebook has been pushing more aggressively

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