For the most part, FOMO is going to automatically pull in useful notifications and display them on your site. However, you can always customize what you see. If you want to show really big product photos, you can do that, or you can highlight where in the world your customers are purchasing from, or you can keep it really minimal and just say that someone purchased a product.

In the end, it's totally up to you, and you can customize your notifications to make your brand.