Enter the username or name of the person you want to block in the "Block users" field 

Click the "Block" button next to the username or name 

Click the "Confirm" button to confirm the block

twitter.com

If you are being harassed or receiving unwanted messages from someone on Twitter, you may want to know how to block them. Blocking someone on Twitter will prevent them from seeing your tweets, following you, or sending you messages. It is a useful tool for protecting yourself from online harassment or unwanted contact.

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