You can only unlike posts, photos, comments and Pages that you previously liked.
Q&A: If I ‘Like’ a post on Facebook, then immediately ‘Unlike’ it, will the person who posted it know about it? Posted on January 1, 2018
Dec 04, 2017 · How to Unlike Something on Facebook. This wikiHow teaches you how to unlike a post or a page on Facebook. You can do this on both the mobile app and the desktop site …
To unlike a Page, go to the Page by clicking its name in your News Feed or searching for it.
If I like someone’s picture in Facebook and then unlike it will there be any notification in Facebook disclosing me?
If you accidentally like someone’s photo on Facebook, and then unlike it, will they be notified?