I think that this banner really conveys a good clear meaning. The contrast of yellow against the gray colors draws the eye to the areas that are marked making it more dramatic. It also uses the caution tape design along the top and the bottom creates the idea of a warning. The text used is also relatable to people by asking the question "what happens to you and your friends", making the cause seem important to anyone.
The History of Advertising on Facebook [INFOGRAPHIC]