You did not manage the downtime to-day.  One post appeared saying the downtime was caused by Facebook, otherwise nothing.

My suggestion is that you consider what might be done another time.

One easy thing to do is to stay in touch with your customers.  Any professional knows that it is better to tell a client that nothing has happened than to say nothing at all.  I suggest a post every hour saying what can be said and, ideally, saying something about how long the downtime is expected to last.  But even if all that can be said is that there is no news yet and that a further post will appear in an hour that would be greatly better than silence.

Secondly, consider closing the game down until the problem is solved - and then give an hour or two's notice before going live.  It is disheartening to be shut out of the game while knowing that your competitors are able to take advantage of your absense.

See if you can do a little research.  If you can establish the number of customers you lose as a result of to-day's downtime you can make an informed guess as to the loss of revenue over a couple of weeks.  Compare that to the loss of revenue during the shut down.

Lastly, if you can manage it, please do not make one of the potted replies.  After a sizeable number of your customers have been shut out of the game for twelve hours the last thing you should do is patronise them.