In business, we’ve learned that niche markets make it much easier to sell a product or service because we can group people based on profession, physical characteristics, and interests.
 For example, a dental supply salesman knows to target dentists and hygienists, and would not bother calling on a craft store.
On the web, a dog trainer knows they should target dog lovers, and if they’re really smart, they target owners of a specific breed of dog.
Anyone who sells anything to anyone online can harness the power of viral videos to get traffic to their website simply by targeting their videos at a specific audience and appealing to the same emotions that encourage people to pass along other viral videos.