Is posting Emojis professional in the work place?

[SilentFilm1988]

I'd like to get some opinions. I'll go more in detail later, but I just want to get some general thoughts. Hypothetically say you work in a fast-paced work environment. You're a professional and you focus on your work. There is also a Skype-like application that your work uses. And you have a coworker that likes to post Emojis every single day in the app. To anyone reading this, do you think it is professional/acceptable to post Emojis in this type of work environment?