How do I block a facebook user from commenting on any of my posts on facebook?

[chichcabob]

There are various ways to do this, i think two.
You can go to "privacy settings", right next to where it says home on the top right corner. then go to "Manage Blocking". There, you can add people to your "restricted list" and such. (It will explain further on the page)
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Or, every time you add a something like a photo album, for example, you can edit it, and make only certain people view it.
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hope this helps!