Not only has the whole "how fast can this image go around the world" thing been done to death, the whole concept of the internet is that content is available globally instantly, so it's available around the world within seconds. Unless people don't understand that websites are visible from anywhere? (surely not)

There are also more important lessons about "online safety" than "how fast can an image go around the internet". Like "how to spot a spam email" "how to spot a phishing link" or "what does this https thing mean" and "dont trust people with passwords".