Facebook share. Change "say something more about this", multiple buttons on the same page

Question

I know I can use ob:description meta tag to change what is displayed by default in "say something more about this" when user clicks Facebook share button.

However, I am adding multiple share buttons dynamically to my page (it's SPA app), each of them refers to different URL, however, how can I assign different "say something about this" for each of them, if I can add meta tag only once?

Answer 1

What you want to change is the User message, right? ("Say something about this..."). Which is not possible at all in the Share Dialog, and it would not be allowed anyway according to the platform policy:

2.3: Don't prefill captions, comments, messages, or the user message parameter of posts with content a person didn’t create, even if the person can edit or remove the content before sharing.