Kill the rumor!

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Across
  1. 1. To write a message on a phone.
  2. 2. To tell something that is false.
  3. 5. To say something to someone in a low voice.
  4. 9. When you do it on social media, the person can no longer send you any message.
  5. 10. To feel guilty/remorse.
  6. 11. Synonym of sad.
  7. 13. Someone who sees that a person is bullied and does nothing to stop it.
  8. 14. It's the contrary of natural.
  9. 16. The name of Mufasa's brother in the Lion King and what is left on your skin after an injury.
  10. 17. To write something on someone's post online.
  11. 18. When you do/say bad things to people.
  12. 19. Someone who isn't nice.
Down
  1. 1. A social network on which you can only write a limited number of words.
  2. 3. You need to do it with an information before you repeat it.
  3. 4. When you have no value.
  4. 6. When you warn people about the potential dangers of something.
  5. 7. When someone is harassed online.
  6. 8. People glued positive notes on it during Positive Post-it Day.
  7. 12. To intensify.
  8. 15. An information which propagates and which is not true/sure.