Don't worry! Even in cases when another user has blacklisted you first, you still have the ability to block their access to your profile at any time. To do this:
- visit the user's page as a guest;
- click the "Other actions" link under the user's profile picture;
- select "Report";
- in the window that appears, check the "Add this person to Black list" box;
- confirm your selection by clicking "Report".
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