Every platform has its method of monetization & Facebook has a donation button and Facebook stars.

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You can purchase a pack from Facebook by visiting a creator’s content and tapping the Star next to “write a comment…” your stars balance Will appear in the upper right corner.

How to Give Facebook Stars to creators?

Tap the star button next to “Write a Comment…” You can also type “!” into the comments field and fill in the number of stars you want to send.