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Hello there!
I am sorry to hear that. I understand you have uninstalled the Facebook for WooCommerce plugin but it looks all the tables were not completely deleted.
I’ve found a similar thread (with a video with steps) that you can check to see if it solves the issue on your site. In short, you can install a plugin like WP phpMyAdmin or you can refer to phpMyAdmin.
Then you can filter the database to look for the names of the tables that are like Facebook, then you can delete them.
Please refer to:
Let us know if this worked for you.