If your communication is straightforwardly positive you can use as many emoji as you want without much in the way of consequences. Sticking :tada: in a Slack an

If your communication is straightforwardly positive you can use as many emoji as you want without much in the way of consequences. Sticking :tada: in a Slack announcement of good quarterly performance, or even an official blog post, is unlikely to upset anyone in the same way "You're fired! :fire:" would.