For instance, the first time someone posts they will see a reminder to choose an audience for that post, and if they don't make a choice it defaults to friends.
The change will have no impact on existing users.
Facebook also announced that it was giving a privacy checkup to every one of its 1.28 billion users.
The changes amount to an about face for the world's largest social network as it tries to appease worries, for both users and regulators, about privacy on the internet.
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