Adsense Will No Longer Serve Fixed-sized Link Units
https://support.google.comLast year, Google announced that link units were being retired. They have now reached the final stage of that process: removing fixed-sized link units from the AdSense interface.
Since fixed-size link units are no longer serving ads, you do not need to take any action. If you previously used fixed-sized link units, they will be automatically removed from the list of ad units in your account.
