FanFiction.NET may be having issues with the feed system today, but I think it is sporadic.
I say this as while I am seeing some updates... I am not seeing a lot.
For example, generally, the Just In Feed fills to it max of 50 every few minutes... but I just left it for 45 minuts and a refresh had 0 updates.
While I have a list of a few hundred authors, and many having tons of stories, and normally I see tons of flagged entries after even a 1/2 hour due to fact system flags feeds even if only a review is left... I had around 5 total after 45 minutes.
This may or may not be affecting the other systems, but I would say it likely the review system if nothing else is affected if I were to take a guess.