It is good internet etiquette to use emoticons in moderation because they annoy some people.
Happy emotions are fun to share. It’s sharing happiness. Emoticons are great ways to share happy emotions. They have slightly different expressions of happiness from the smiley to a smiley with a wink. It’s fun, have fun.
Emoticons are annoying to adults because they are often thought of as childish. They are considered childish because teens made their use popular. It is appropriate to use an emoticon if you are just kidding or writing something sarcastic. It is innapropriate to use an emoticon for professional communication because professional communication is serious.