What are some of the social media etiquette you would like to tell?

I am really bad at texting back and forth. People who don't know me well consider me rude on social media. I had a friend who used to think I was mad at her because I used period at the end of my statement. Also, I never used any emoji. I would leave messages read. I didn't have anything to add on that so I felt it okay to leave messages on read. So, I am very curious to know some of the social media etiquette.
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