http://www.washingtonpost.com/blogs/the-switch/wp/2018/06/07/a-facebook-bug-publicly-shared-the-posts-of-14-million-users-who-thought-they-were-making-private-posts/

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.