Stumbled upon a Github Gist containing a simple, straightfoward piece of Javascript in it.

// Remove All Your Facebook Likes setInterval(() => { for (const Button of document.querySelectorAll('div[aria-label="Action options"]')) { Button.click() for (const remove of document.querySelectorAll('div[role="menuitem"]')) { remove.click() } } }, 1000)

After grabbing the gist, visit https://www.facebook.com/{your_id_or_username}/allactivity/?category_key=LIKEDPOSTS&filter_hidden=ALL&filter_privacy=NONE after replacing {your_id_or_username} with your Facebook ID or username in that URL.

Open the console, Command + Shift + J usually or just right the background of a webpage and click Inspect Element, then click Console and paste the code above and hit Enter. Depending on how active you were, this may take a time or hit an API limit. You can always try again later after some time; my guess is 24 hours.

Enjoy some privacy. 😁