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Answers
There is a facebook extension in rapidminer marketplace.
https://marketplace.rapidminer.com/UpdateServer/faces/product_details.xhtml?productId=rmx_facebook
You have a find comment operator that works based on post Id etc.
Please inform if you need more information. There are also posts on community related to facebook extension.
Varun
https://www.varunmandalapu.com/
Be Safe. Follow precautions and Maintain Social Distancing
Note that extracting comments from Facebook pages (even public ones) is against the TOS:
https://www.facebook.com/apps/site_scraping_tos_terms.php
Scott