This question already has answers here:
From my personal experience facebook notifications are not reliable.
I have developed a few apps that rely on real time updates from facebook and I have experienced following issues:
- Updates/callbacks getting lost
- Updates delivered days later
- When facebook updates graph api version some of the apps work that are still on old version and those that you migrate do not work.
Sometimes to fix it I would remove all subscriptions and re-add them again.
After a while I got tired from this and now I do pull as well and real time updates also I have implemented logging and monitoring.
I hope this helps
Need Your Help