To earn money by shortening links on Facebook, you must first register to CPMLink link shortener service. You can use these services to create a shortened link.
Next, you can share the shortened link on Facebook. When people click on the link, they will be directed to an advertisement page first. After passing through this advertisement page, they will be redirected to the original link. You will earn money through ad impressions during this process.
The amount you earn will depend on the number of ad impressions, click-through rates, and the amount paid by advertisers. However, although it may be difficult to earn very high amounts, you can earn additional income by regularly sharing shortened links.
When using this method, it is important to ensure that the links you share do not contain spam or unwanted content. Otherwise, the number of people clicking on your links may decrease, and therefore your income may also decrease.