Use of emojis in git workflow

What are the benefits of using emoji's in git commit messages?
Example [here](https://github.com/jrans/check-mail) (or any of [jrans's projects](https://github.com/jrans))
If a team desides to use them, what do they all mean and what commit message conventions should you follow with them? ([cheatsheet?](https://github.com/dannyfritz/commit-message-emoji))