After following a good amount of players i have learned that is hard to delete those who leave the game for good in the follow-up list. In the friend list we know the time of their last log in, but we miss this in the follow-up list.
It could be useful if we could get a hint for those players who are away from the game for more than 60 days for example. Some different colour in the name of the player in this list could be enough. So we can choose to delete this player from the list.
This will improve the uselfullness of this list and it will make easier to keep only active players there.