It is very possible to remove people who liked your Facebook Page and they'll no longer like it. But also keep in mind that Facebook Pages are public spaces, and people you've removed can choose to like your Page again. If you think they are bombarding your page with spam posts, then, banning them from your page is the best option.
How To remove someone who likes your Page:
- Click Settings at the top of your Page
- Click People and Other Pages in the left column
- Click to check the box next to the person you want to remove
- Click
and select Remove From Page Likes
- Click Confirm
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