This emoji can be used in almost every positive situation; chatting to friends, responding to social media messages or when you’re just trying to spread some good vibes in general. This is the kind of emoji you should use when checking out pics of a friend’s new puppy. Or when you receive news that tonight's dinner is going to involve burgers. 

There’s also an arguable romantic inclination to this emoji; the rosy cheeks could be perceived as blushing, so it could be a suitable choice when messaging a potential partner or someone you like.