Emojis are a contentious topic. Sometimes they're a great way to communicate emotion or to lighten the tone. Sometimes they're too informal for the situation. Sometimes, according to a few news reports when emoticons first became a mainstream tool, they're a secret code. At the end of the day, all they are is another tool for communicating with your audience. You don't want to use them too often and lose your brand's authority. Neither do you want to come across as too stiff