Follow the steps below to delete Facebook Favorites (unlike things you've liked).

Delete Facebook Favorites

1. Log into Facebook.
2. Clink on your account name at the top right or left of the screen.
   
3. Click on the 'Activity Log' button.
4. Click on 'Activity Log' again and select 'Likes'.
   
5. Click on the little circles next to the activity you want to unlike and select 'Unlike...' from the drop-down.
   
6. Click 'Unlike'.