How to delete the social feed ause_cn？

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I saw a social feed ause_cn in directory。 and then I clicked it once and onece and it didn’t respond. As a result, a lot of comments appeared in my profile.How do I delete it？

 

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Also, how to hide the tic-tac-toe logo in the upper left corner of the interface?I'm a bit obsessive about interfaces，need help~