HOF Coins And Spins
When you are login all the bonus that you have clicked will be moved in your Click History and the default list will only show the links that you have not clicked yet. This will help you from clicking the same links over and over again because you can claim them once.
Maybe they put a click limit who can claim the free spins? Free Spins links came from Facebook User Timeline, same type of links you post when you get a big win or hit 5 of a kind, etc... If a player has too many Facebook Friends they are the ones who can get them first before it is shared here.