We are aware of the recent reports of managers having their friends vanish from Top Eleven. This is an issue on Facebook's end and we are working closely with them to resolve it as soon as possible. As it's something we can only affect in limited capacity, we aren't able to give an estimate on when exactly this will be fixed.
We are also looking into how this interacts with losing friends who were your referrals.
We apologize for any inconvenience this may have caused and thank you for your patience.
UPDATE: We have just received an update on this issue and there should be a fix out net week.