Libel

1. “Megan Fox is a man!” Headline on Weekly World News Web site

Not libelous. Megan Fox, as a celebrity, is not held to the same libel rights as an ordinary citizen.

2. “Up until the day he died, he was a brilliant writer. But the drugs made him a thief, a pimp and a liar,” said friend Karen Smith, who was with Johnson at the time of his death.

Not libelous. There is a quoted source, and Johnson is dead. It would be a different story if he were still alive.

3. “In my opinion, Kevin is a murdering rapist,” the prosecutor told the jury.

Not libelous. What was said is public knowledge since it was said in a court of law.

4. "In my opinion, he's a murdering rapist," the man said at the rally.

Libelous. There is no source listed. It could be the writer himself using a made-up source as a mouthpiece for his own opinion for all we know.