Click through to AdAge to read "What to do if people are messing with your brand online"> Ad Age Digital DigitalNext MediaWorks What happens when people use your brand in unconventional ways? Sometimes you end up with the Diet Coke and Mentos experiments. Sometimes you get "How to Smoke Smarties." In the latest example of a social-media world where any 10-year-old with a half-baked idea, your product and a cheap webcam can seek his or her 15 minutes of online fame, dozens of YouTubers -- mostly junior-high-school kids, it seems -- are posting videos of themselves and their friends crushing up the cellophane-wrapped, pressed-sugar candies, sucking the candy dust out and puffing it into the air in mock-smoking style. It's not a new fad.