Facebook has another apology for you. The company said Thursday that a bug in its system caused it to publicly share the posts of 14 million people who thought they were making private updates.

The company said the mistake happened as it worked to redesign how it displays parts of user profiles that are always public.

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Facebook posts are public by default for new accounts, but every Facebook user can limit who sees each post by using what the company calls an "audience selector." Users can also make new posts only visible to friends or sub-groups of friends, for example, by altering this default through their privacy settings.

But, for four days in May, the bug ignored user preferences and set the default audience for all new posts to "public," the company said. Facebook stopped the bug on May 22, but did not restore the proper privacy settings to all posts until May 27.