Some users are reporting that they are unable to post today’s
    big story about a security breach affecting 50 million
    Facebook users. The issue appears to only affect particular
    stories from certain outlets, at this time one story from The
    Guardian and one from the Associated Press, both reputable
    press outlets.
    ...
    The situation is another example of Facebook’s automated
    content flagging tools marking legitimate content as
    illegitimate, in this case calling it spam.