While we're protecting you from making mistakes, you may want to take a peek about what they’re sharing on Twitter, right? To do that, the best way is sending them to a Twitter list and checking what they're sharing every once in a while.
Go to your Blacklist page by navigating to https://circleboom.com/blacklist/
Select the accounts you want to add to a Twitter list
Click on the "Blue button" with the text
Add selected to Twitter List
Create a new Twitter List or add to an existing one.