The truthfulness of the most shared internet articles

According to this video titled ” This Video Will Make You Angry” by the youtube channel CGP Grey. https://www.youtube.com/watch?v=rE3j_RHkqJc 1. What is the definition of a “viral video”? 2. Why do some internet articles get more shared than other videos? 3. What does the author imply about the truthfulness of the most shared internet articles? 4. What happens to internet articles that stick strictly to the truth and do not add statements to be more interesting? 5. What is the/any internet article that can make a person react so strongly that they shared it immediately with their friends? 6. How is this video relates to diseases or germs?