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All you need to do is add a couple lines of CSS under customize journal and click where it says "reload page in style: mine".
In light of certain parties using the post calling them out to find new people to pester, I wanted to remind people that in addition to blocking users from making comments on your journal you can use CSS to hide their posts so you don't have to see their nonsense. Just remember to view comments in your style to make them disappear!