YouTube's top earner is a woman who films clips of herself unwrapping children's toys.
If there's anything you can say about kids' behaviour online, it's that trends move quickly.
Suddenly, we were faced with the prospect of our 5-year-old owning a tablet, on which she could play games, practice reading or surf the internet.
There are two types of pinners: people who do it for fun and businesses that want to entice customers. Here are some key tips for each.