A roundup of some of the most popular but completely untrue headlines of the week. None of these stories is legit, even though they were shared widely on social media. The Associated Press checked these out; here are the real facts:

NOT REAL: BREAKING: Second Parkland Shooter in custody

THE FACTS: Reports about a second shooter at a high school in Parkland, Florida, this week started with a tweet from an account falsely purporting to be former Fox News host Bill O'Reilly. The account was later suspended and police say that suspect Nikolas Cruz acted alone in the massacre that killed 17 people....