Shadowbanning thigie on Twitter

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What is going on? Ya. Many of my friends have recently been shadow banned in Twitter. I was too but my ban was lifted after I sent Twitter support message about it. It seems they shadowban you for saying the word "Shadow ban." I also heard a rumor about people being banned for saying "Thank you." Does anyone know what is going on on there? :( I feel too scared to post anything on there anymore.