We all know that this bug exists and it can't be fixed but there are two possible ways to prevent people from abusing it.
Here are my ideas:
- Have it where you would have to wait for a certain amount of time to be able to unfavorite an image or video after you first favorited it. This would be similar to what we have for the voting system right now.
- Have the favorite become permanent once you click it. It would have a confirmation box like what we have for downvotes.